Undercover agent Mark Sheldon gets paroled to a remote tropical island with a diamond mine manned by slave labor run by sadistic Stephen Danel.

Sadistic Stephen Danel owns a penal island, and when he is not humiliating and mistreating his wife, he is torturing his convict prisoners and using them for slave labor. Government agent Mark Sheldon is sent to infiltrate the island and bring Danel to justice.—Ken Yousten <[email protected]>

Stephen Daniel, sadistic lord of a small South Pacific island manned by paroled convicts who work his diamond mine, has Mark Sheldon, in reality a secret service agent seeking to smash Daniel's vicious racket, released from prison to work for him. Daniel's wife, Lorraine, is kept prisoner and asks Sheldon to help her escape.—Les Adams <[email protected]>