The razor
(Book)

"Marcus Flynn has been sentenced to the terrifying prison planet known as 11-H37. There's only one problem. He's innocent. He's barely made it through the first day when everything changes: All the guards and prison personnel suddenly abandon the planet, leaving the inmates there to die. There is more to 11-H37 than meets the eye and Flynn soon finds himself making unlikely allies and the most dangerous of enemies" --,adapted from publisher description.