Procedure Zero

You were an auditor. During an inspection you found something in the documents that you were never meant to see, and you made a copy. A few days later you're in prison. There's no sentence and not even a name in your file, only the word ZERO.

Every now and then the lights go out in the block. When they come back on, one of the bunks is empty, and no one ever sees the man who slept there again. You're next on the list.

You uncovered a fraud, so they locked you up. Prisoners are quietly disappearing, and you're next. Sneak past the guards, trade cigarettes for information and take over the prison before they come for you.