When a singing, song-writing prizefighter is framed for murder and sent to the state pen, his girlfriend sets out to prove his innocence.

A chemical manufacturer is killed just after asking detective James Wong to help him. So Detective Wong decides to investigate this as well as two subsequent murders.

Celebrated as supersleuth, Mr. Moto comes out fighting when a brutal boxing match turns into cold-blooded murder! Assisted by detective-in-training Lee Chan, Moto sets out to track down the killer…