District Attorney Grant Gardner and Police Commissioner Dryden were asked by Mayor Randolph to investigate suspicious suicides among scientists and businessmen, all found holding a small scarab.
The costumed hero was really Grant Gardner!
They discover that all of the suicide victims were members of a Mayan expedition. Professor Lyman was one of the last survivors and turned to his friend and fellow survivor, Dr. Maldor, for help.
However, Maldor (as the Scarab) was behind the "suicides" which he planned as revenge for his lack of recognition in organizing the expedition. He killed them using "Purple Death", a hypnotic chemical. Maldor decided to force Lyman to give him the location of plans for a "Dynamic Vibrator" - a device intended for mining operations but one that can be amplified into a devastating weapon.
Grant stopped Scarab's minions from stealing the plans for the Dynamic Vibrator. So, Scarab tried to get a working device with several failed attempts.
Grant's love interest was Gail Richards.
Captain America created by Jack Kirby and Joe Simon.
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