The Final Hour: The Homelander Series by Andrew Klavan
Is there no way out for Charlie West?
Jailed for a murder he didn't commit, Charlie is killing time and praying nobody kills him. Charlie was just a normal schoolboy when he woke up unable to remember the last year of his life. Now his memories are returning in sudden painful flashbacks - memories of going undercover in a terrorist organisation.
There are people inside that want Charlie dead and he's not sure who poses the greatest threat - his fellow inmates or the guards. But Charlie isn't the only one in danger. Something terrible is about to happen and Charlie is the only one who can stop it. First he's got to get out of prison...and fast.