Mark Sheldon (Robert Wilcox) is tasked by the secret service to investigate the mysterious Danel (Lorre) who has his own island, and who accepts paroled men to work for him there. However, it is rumoured these men are horribly treated, treated as slaves and tortured. Sheldon is arrested after an unknown assailant kills a fellow agent, Sheldon allows himself to be arrested for murder and sentenced! Some time later he is paroled and is sent to Danel's island.
Sheldon finds a brutal regime of slave labour, with public floggings a regular occurrence. Danel is also treating his wife (Rochelle Hudson) as a prisoner. She soon has the hots for Sheldon...
An enjoyable romp. Peter Lorre plays Danel with relish, not so much chewing the scenery but having it on toast. The story itself is a little heavy in the whippings and violence but Lorre makes it very entertaining.