Robert Sheckley 
Status Civilization 

On a savage prison planet, a reluctant killer searches for his memory He awakes in the cell, his mind blank save for a faint memory of standing over a dead man with a gun. Guilty of murder, his brain has been wiped, and he has been transported to Omega, the prison planet, where evil is worshipped as a god. His jailers inform him of his name, Will Barrent, his crime, and the average life expectancy in his new home: three years. Every day will be a battle for survival, and one day, he will lose.   Although run by criminals, Omega is hardly lawless. The population has been divided into an intricate caste system, and Barrent is on the bottom. The only way to advance in rank is to kill. While Barrent knows in his bones that he is no murderer, he sees no alternative but to give in to the crime that sent him here. He will kill if he must, but he will never lose himself again.