迈克·斯特吉斯和他的弟弟罗伊，被以捏造的火车抢劫罪判处押解到尤马监狱。两人都忍受着残酷的对待，然后迈克逃走了，报复他们的敌人。

A cloaked figure slips into an exclusive psychiatric clinic and murders one of the female patients. Meanwhile, various sexuals liaisons are revealed. The mystery killer continues with his massacre he beheads a nurse with…

　　一个女记者为调查小岛女子监狱的黑暗,孤身一人以合理借口入驻此监狱。在这里,她目睹了监狱女犯们的种种不幸和遭遇。有的女犯在别的女犯掩护下,冒死与前来给监狱送工料的猛男火速偷情；有的女犯因不从狱长夫妇的严酷管理,遭到的是更无…