An elderly inventor falls wounded at the door to Craig Kennedy's criminologist laboratory and, a short while later, Police Inspector J. J. Burke finds the wounded man's partner shot to death in his palatial home. Cross trails of evidence point toward several suspects and Kennedy unravels the mystery, and is almost murdered himself when he discovers the killer's desperate ruse to free himself from suspicion. The identity of the killer provides a surprise when Kennedy's deductions and quick actions, aided by support from Inspector Burke and Evenening Star reporter Walt Jameson, prevent another murder.
—Les Adams <longhorn1939@suddenlink.net>