The all-female Butterfly Gang have their fingers in seemingly every criminal enterprise imaginable. When the police manage to capture Playboy, their lone male member, they know this is their opportunity to bring the whole enterprise down. So Playboy is shipped off to the most secure prison in the nation for safekeeping. But no prison is unreachable for the Butterfly Gang, and it takes barely a heartbeat for things to go wrong. Soon the prisoners start a riot and trap a small police squad inside, which will try desperately to save their lives.