An army sergeant and a office worker have a scam in which they use bar girls to claim G.I. widow benefits, and then murder them to take the cash. McGarrett and company must use the girls to get to the core of the plot.

A Japanese World War II veteran, Yoshio Nagata, escapes from a mental hospital and tries to carry out his wartime orders to blow up a refinery.

A middle-aged mainland hardware salesman uses a prostitute, and then witnesses her murder by a mobster. He refuses to testify because of the damage to his reputation and that he doesn't want to be involved. McGarrett must persuade him to do the right thing.

Lew Morgan and his wife are friends of Danno, but she is murdered, and Morgan sets out to find the culprit. However, his wife seems to be hiding secrets that may have caused her death.