In Puerto Rico to investigate a glut of contraband diamonds that are flooding the world's jewel market, Mr. Moto and his sidekick, a wrestler, find themselves involved in murders by thrown daggers, the frame-up of an overstressed Army colonel, and a pirate gang led by an unknown boss who has inside knowledge of the ensuing investigation.

一个年轻的女人正在为谋杀罪受审。镜头闪回，我们得知她努力克服贫困作为一个十几岁的孩子——一个错误的逮捕和监禁盗窃和参与就业导向缺乏长期与歹徒。在妓院里，她遇到了一个年轻的律师，一个富有的和有声望的家族的后裔，他爱上了她并帮助她围着她转的生活。但她的过去赶上她，她必须面对的音乐，而不是导致他丑闻。