Spoiler warning: this article discusses the death of James and Lily Potter, Voldemort’s return, and events up to the final book. If you are partway through the series, this will spoil the ending.
Peter Pettigrew betrayed James and Lily because he believed Voldemort would kill him and his family if he refused, and because he had decided long before Halloween 1981 that loyalty to a losing side was a bad bet. He was their Secret-Keeper, so he could tell Voldemort exactly where they hid. Nobody tortured the information out of him. He gave it up.
That is the short version. The longer version involves a boy who never felt he belonged to the Marauders, a Harry Potter fan forum thread that has been arguing about him for years, and one detail most explanations skip: Voldemort’s men already knew Pettigrew was a Death Eater before he was ever asked to be the Secret-Keeper.
Table of Contents
- What Made Peter Pettigrew Choose Voldemort?
- How Peter Pettigrew Betrayed the Potters
- What Did Pettigrew Fear for Himself and His Family?
- Was Pettigrew Loyal to Voldemort or Protecting Himself?
- How Did Pettigrew Help Voldemort Reach the Potters?
- Did the Prophecy Matter to Pettigrew’s Betrayal?
- Did Pettigrew Have Another Choice?
- Is Peter Pettigrew a Sympathetic Character?
- Frequently Asked Questions
- Conclusion
What Made Peter Pettigrew Choose Voldemort?
The books give one plain declarative line about Pettigrew’s reasoning. He defected having come to believe that nothing could be gained from opposing Voldemort, and that there was a better chance of surviving on the winning side.
That is unusual in a series full of true believers. Voldemort attracted people who shared his views about Muggle-borns and magical supremacy. Pettigrew did not. What attracted him was momentum.
- Fear for his own life. He had seen what happened to people who stood in Voldemort’s way.
- Fear for his mother. Anne Pettigrew was a known Death Eater supporter, which made refusal genuinely dangerous.
- Loyalty to whoever looked strongest. His whole Hogwarts career was spent orbiting the Marauders because they were the toughest group in school.
- Status hunger. Being important near powerful people was the role he wanted.
- Moral cowardice. He chose the option that kept him comfortable rather than the one that cost him something.
Fear explains the pressure. It does not explain away the choice, because the Secret-Keeper role had already been out of his hands by the time Voldemort arrived in Godric’s Hollow.
How Peter Pettigrew Betrayed the Potters
The sequence took shape long before the attack itself. After Pettigrew left the Order of the Phoenix, Voldemort’s people approached him. They knew about his mother. They knew he had already been talking. The Potters, Sirius Black and Remus Lupin were all being watched, and Pettigrew was the obvious source to ask.
He did not go to the Order and say Voldemort had him. He waited to be asked, then told them where the Potters were. Voldemort walked into Godric’s Hollow, and the Fidelius Charm did nothing, because Pettigrew was the charm’s only lock and he had just opened it.
The chain of choices, step by step
| Step | What happened |
|---|---|
| 1. The approach | Voldemort’s Death Eaters corner Pettigrew, who had already defected from the Order and whose mother was a known supporter. They make clear that refusal is not survivable. |
| 2. The defection | Pettigrew stops passing information to the Order of the Phoenix and begins passing it the other way. |
| 3. The report | He tells Voldemort that the Potters are in Godric’s Hollow. As Secret-Keeper, this is the only way Voldemort could learn it. |
| 4. The deaths | Voldemort attacks the house. James and Lily are killed, Harry survives, and Voldemort is destroyed. |
| 5. The cover-up | Pettigrew fakes his own death with a hock of beef and a bit of spell, leaves twelve Muggles as a false trail, and becomes Scabbers. |
Afterwards he faked his death, left a trail of murdered Muggles to draw attention away from the real traitor, and spent twelve years in the Hogwarts kitchens as everyone’s pet rat. Sirius Black took the blame and went to Azkaban instead.
What Did Pettigrew Fear for Himself and His Family?
Pettigrew believed, correctly as it turned out, that Voldemort did not make idle threats. Everyone who had opposed him in the first war was gone, imprisoned, or hiding. From where Pettigrew stood, refusing the order to hand over the Potters’ location meant joining that list, and his mother was already on Voldemort’s side.
That is why so much of the fandom resists reading him as a willing traitor. The stakes he imagined were real, and he was a teenage boy with no plan and no powerful allies beyond three friends who happened to be at war.
But notice what the fear did and did not cover. It covered Pettigrew. It did not cover James and Lily, whose names he volunteered, or Sirius, who ended up in Azkaban, or the twelve Muggles he murdered to cover his tracks. Fear is a reason for a person to be careful. It is not a reason to hand over an address.
Was Pettigrew Loyal to Voldemort or Protecting Himself?
Protecting himself, mostly. Pettigrew served Voldemort as insurance. He had spent his school years hanging around the Marauders because being near James, Sirius and Remus made him feel safe and important, and he did the same thing again with a more dangerous group.
He was not a pure-blood supremacist and nothing in the books suggests he cared about Voldemort’s ideology. What he wanted was proximity. Being a Death Eater meant being safe from the people who would otherwise condemn him.
There is also a part of him that enjoyed it. Pettigrew liked the idea of being important, and after Voldemort fell, the place he chose to hide was Hogwarts, inside a castle protected by people he had betrayed. Even his hiding spot was an attempt to be near power.
How Did Pettigrew Help Voldemort Reach the Potters?
This is the part worth lingering on, because the mechanics are strange. The Fidelius Charm hid the Potters’ location inside the Secret-Keeper’s mind, where it could not be read, forced or tortured out. Voldemort’s Death Eaters spent months searching the country and never found them.
Which raises the question fans keep asking: if the charm cannot be broken, why did Pettigrew talk? The answer is that Voldemort did not need to break anything. The charm had no protection against a Keeper who wanted to share the secret. Pettigrew’s betrayal had to be voluntary, and it was.
Then there is the circularity that some readers call the story’s biggest logical problem. Pettigrew chose the winning side because Voldemort was winning, yet Voldemort was winning largely because Pettigrew had been feeding him the Order’s secrets. He was backing a winner he was personally responsible for creating. If the Order had survived, Pettigrew would have been one of the good guys with a comfortable story about it.
The complaint is fair, but it is a complaint about the writing as much as the character. Pettigrew is the argument the series makes about what pure opportunism looks like from the inside. He never worked out that switching sides was not the same as being safe.
Did the Prophecy Matter to Pettigrew’s Betrayal?
No. The prophecy about Harry and Voldemort is the reason the Potters went into hiding, and hiding is the reason they needed a Secret-Keeper. But it plays no part in Pettigrew’s own reasoning, because he was an opportunist, not a participant in the prophecy’s story.
That distinction matters when people argue about whether Pettigrew knew Harry was the one the prophecy meant. There is no canon evidence that he did. He betrayed a house, and Voldemort was killed at that house by a baby.
Pettigrew only became important to Voldemort’s prophecy narrative years later, when Voldemort returned and Pettigrew rejoined him. That is a second defection, not the first.
Did Pettigrew Have Another Choice?
Some, though fewer than people assume. He could have warned James and Lily and gone to ground with them. He could have gone to Dumbledore. He could have run to his mother rather than to Voldemort.
The strongest evidence is uncomfortable for anyone defending him. Pettigrew’s defection was already known. Sirius did not volunteer him out of nowhere; Sirius was sick with worry about a known Death Eater being chosen as Keeper, and Pettigrew came up precisely because Sirius was trying to avoid the obvious candidates. Sirius believed Pettigrew had left the Order, and that belief was wrong.
So the choice was not between betraying the Potters and dying. It was between betraying them and dealing with a war that frightened him, having already lost the nerve for it once.
Is Peter Pettigrew a Sympathetic Character?
Sympathetic is not the same as justified, and Pettigrew is much easier to explain than to forgive. A widely shared reading over on r/harrypotter is that he never really belonged to the Marauders at all, that he was the one they let tag along and he knew it, and that he chose being close to power over the people who gave him a place.
The books support that reading. Pettigrew spent thirteen years showing Harry the version of the past he wanted, framed Sirius for a murder he did not commit, and murdered twelve Muggles to protect himself. Harry calls him a rat in the most literal and least flattering sense.
And yet regret shows up late. When Harry saves him from Nagini in the Shrieking Shack, Pettigrew hesitates, and Harry notices something that might be remorse. He pays for that hesitation with his own life at Malfoy Manor, begging Voldemort to use another wizard for the ritual and drinking the drink meant for Harry. Whether that is redemption or just a dying man’s bid for delay is left open on purpose.
As of 2026, Pettigrew is still the most argued-about character in the series, and the argument is usually about whether a coerced choice can ever be a free one.
Frequently Asked Questions
Is Peter Pettigrew completely evil?
Not by intent. Pettigrew did not care about Voldemort’s cause, and what he wanted was survival and status. But he chose to kill James and Lily, framed Sirius Black for murder, and murdered twelve Muggles to cover his tracks. Motives that are entirely selfish still produce monstrous acts, and the books treat them that way.
Was Pettigrew forced to betray James and Lily?
Coerced, yes. Compelled, no. Voldemort threatened him and his mother, which is why Pettigrew gave up the location. But the Secret-Keeper role was forced on him by James and Sirius, not by Voldemort, and Pettigrew had already left the Order of the Phoenix beforehand. He chose to help, which is why the betrayal counts as an act of will.
Did Peter Pettigrew betray Sirius Black to Voldemort?
Not directly. Pettigrew did not tell Voldemort about Sirius. He faked his own death, left a trail of dead Muggles, and let the evidence point at Sirius, who was seen at the scene and had James’s old cloak. Voldemort had already used the Marauders’ cloaks for his own disguise, so the frame fell into place on its own.
Why did Pettigrew become a rat in Harry Potter?
Becoming an Animagus solved two problems at once: it let him hide from both the wizarding world and his victims’ families, and it gave him a reason to be inside Hogwarts where the castle wards kept him safe. He lived in the kitchens as Scabbers for twelve years, feeding off scraps and staying just close enough to the school to matter.
Did Peter Pettigrew believe in Voldemort’s cause?
No. Unlike most Death Eaters, Pettigrew had no interest in Muggle-born rights or pure-blood supremacy. He attached himself to whoever was winning because that was safer. When Voldemort fell, he hid. When Voldemort returned, he came straight back, which says a lot about what he actually valued.
Is Pettigrew more sympathetic than Snape?
They are sympathetic in opposite ways. Snape picked a side and paid for it in misery for years, while Pettigrew picked whichever side kept him comfortable and paid only at the end. Pettigrew’s late remorse at Malfoy Manor is real in the text, but Snape’s whole life was a repaying of a debt. Different scales of guilt, and Pettigrew’s came with more people dead.
Conclusion
Peter Pettigrew betrayed the Potters because his family was threatened, because he had already decided that the winning side was the safe side, and because nobody ever made him choose between courage and comfort until it was too late. The Secret-Keeper role made the betrayal possible, not inevitable.
So why did Peter Pettigrew betray the Potters? Read the warnings in order: a defection that went unchallenged, a mother already inside the enemy camp, a friend who chose him precisely because he seemed expendable, and twelve years of hiding in the one place nobody would look. Judge him on the last choice, the one where no one was holding a wand to him.