Cat and mouse

After 14 year old Jamie Hears that his 13 year old best friend Kira was kidnapped on her way home from school, and later murdered, he feels that her murder was partially his fault!
Even after the investigation closes, and a suspect is arrested, Jamie doesn't think that the whole story has been told!
He thinks a different person is at fault!
Has he found the truth?
Was it all a setup?
Or Is it all just a game of cat and mouse?