General Irwin, a respected three-star tactician whose career ends in disgrace when he's court martialed and sent to a maximum security military prison, The Castle. Irwin quickly butts heads with the facility's autocratic warden, Colonel Winter, who runs his command with an iron fist, even killing prisoners when he deems it necessary. Irwin rallies his fellow convicts into a rag-tag army and leads them in a revolt against Winter, an action that the warden is ready to repel by violent means.