Berserk — Ally Kennen

You'd have to be crazy to make friends with a murderer. When 15-year-old Chas finds a website asking people to write to prisoners on Death Row, he decides it would be funny to get letters from a murderer. He writes to an inmate, pretending to be his mum, but the chilling replies are not at all what he expects. Chas's own wild escapades eventually land him in a young offender's institute, where he learns that his scary penpal has been released. And is heading for England to find him...