The Daily Clarion hires detective story writer Steve Colt to investigate the deaths of a group of scientists working on an atomic rocket development project. Behind the killings is fortune teller Sombra, a spy from an Asian country intent on world domination, who is determined to pilfer the atomic rocket by luring workers from the project to her parlor and killing them with black widow spider venom when they refuse to cooperate.
Steve Colt

Joyce Winters (as Virginia Lindley)
Sombra, The Black Widow

Nick Ward

Ruth Dayton

Dr. Z.V. Jaffa

Porter-Spy
Hitomu

Dr. Ann Curry

John M. Walker

Prof. Henry Weston

Dr. Godfrey

Bradley

Blinky

Michael Burns

J. Carter

A. Kabob

Spike

Slade
Finnegan

Burke
District Attorney Mark

Filmore Hagen

Dr. Harcourt

Mendoza