Peter Pettegrew was perhaps the most slippery character in the Harry Potter movies.
Peter's animagus transformation and his cowardly nature allowed him to get away from situations that most other people would not.
So he was very careful when he made the plan to capture the rat animagus. And he was even more careful when he created the prison for him.
It took him a few days to create a multi layered prison in the chamber of secrets with runes adorning it's grey walls that stops any kind of transfiguration magic from being used inside it. Especially the animagus transformation.
He did not know how to create wards that stops apparition and portkey travel so he had to rely on runes to make do.
Still, creating this prison made him realize that he had absolutely no knowledge about wards. A problem that he would be sure to overcome in the future when he is not working on so many projects at once.
Regardless, he had done an excellent job with the runes but even if the runes somehow stop working and Peter was able to transform into a rat, he would not be able to run away as the prison walls had so little space between them that even a rat would not be able to escape from within it's confines.
The runes also made sure that Peter won't be able to dig a hole through the walls.
All in all, he thought that he had done a wonderful job and if despite all these preparations, the rat animagus was still able to escape then he truly deserved his freedom.
With such thoughts, he waited in front of the portrait of the fat lady with patience.
The freedom of one Peter Pettegrew was about to be forfeited.
—————
Madam Amelia Bones,
It has come to my knowledge that my godfather, Sirius Orion Black, Lord of House Black was thrown into Azkaban 10 years ago without a proper trial.
I know people think that he was the right hand man of Lord Voldemort and betrayed my parents, Lily and James Potter to him, later killing Peter Pettegrew and 13 muggles before he was caught by the Aurors.
But that is not true.
I have evidence that it was Peter Pettegrew who betrayed my Parents to the Dark Lord and I also have evidence that Peter Pettegrew is not dead.
I know this might all sound rather preposterous, especially when coming from an 11 year old but this is the truth.
I have heard that you're an honest person who believes in following the law and doing the right thing without any discrimination so I'll ask you to ignore my age and give serious consideration to this letter.
If you still find it hard to believe me, then search in the achieves of the DMLE. There you'll find that Sirius Black was thrown into Azkaban without ever receiving a proper trial.
After that, you can contact me in Hogwarts for the location of Peter Pettegrew.
I'll be waiting for you.
Good day,
Harry James Potter
—————
Mrs. Andromeda Tonks,
It has come to my knowledge that your cousin, Sirius Orian Black was never given a proper trial before he was chucked into Azkaban on the groundless accusations of being a Death Eater.
I don't know if you and Sirius were close or not but I can assure you that he truly considered James and Lily Potter as his family and would have died a thousand times before letting any harm come to them.
Now I'm going to tell you what really happened in the night when my parents were killed by Voldemort.
You may believe me or you may think of this as the stupid rambling of a madman but I implore you to read the full letter before making any judgement.
(Then he went on to briefly explain the true history of the Potters.)
(How Sybil Trelawny gave a prophesy that claimed that the Dark Lord will be vanquished by a child born at the end of the 7th month which became the reason why he went after the Potters and the Longbottoms.)
(How under Albus persuaded the two families to go into hiding.)
(How Sirius thought that he would be too obvious as a Secret Keeper of the Fidilius charm which was why they changed the Secret keeper to Peter Pettegrew instead.)
(How Peter Pettegrew betrayed the Potters which led to their death at the hands of Voldemort.)
(How the curse rebounded and Voldemort died instead of him.)
(How Sirius, consumed by rage and grief over the death of a friend whom he considered his brothers, chased after Peter in the muggle london and how Peter deceived him, killing the muggles and framing him for their deaths.)
Whether you believe me or not, that choice lies entirely up to you. In case you did believe in me, I would ask you to persuade your husband to take up Sirius Black's case in the court when the truth of the matter is revealed to the masses.
I don't think any other attorney would be willing to take up his case and I myself am too young and too ignorant of the Wizarding to laws to be of any help to my god father.
Whether you try to help me or not, I will expect a letter from you. Because even without this event, my grandmother was still your aunt, which makes you the closest thing to a family that I've got.
Good day,
Harry James Potter
So for all those people who were wondering about the fate of Peter Pettegrew and Sirius Black, this is it :)
Hope you liked this chapter.
And have a good day :)