The One Thousand: Book One - The One Thousand, #1

It is the late 1960s... What better place than prison to recruit psychopathic killers?  So thinks Benny, possessed by a thousand alien entities which he intends to share around with the other inmates before unleashing hell on Earth in the form of a murderous rampage.  Only William Stafford, a Vietnam War veteran unjustly convicted of killing a girlfriend, can stop him.  But to do so he has to break back into the prison he has just escaped from...