There were no tell-tale traces of blood, no traces of struggle, no clues that Lieutenant Phelan could put his fingers on-yet someone had plunged a knife into Lawrence Straw, an auditor with a deft head for double figures, and deposited him in a not-too-private self-service elevator. Suspects are too few. A wealthy widow with an acid tongue, a small- time gambler with an unpredictable wife, a hard-boiled restaurant owner, a popular lecturer, a college professor, a night club operator and three lovelies who pose for forbidden photographs. All have alibis. And Lieutenant Phelan is more stumped than ever when his No. 1 suspect is murdered in the same way. Professor of Psychology Caldwell then steps in to give Phelan a hand. He sends out his irrepressible assistant, Bendy Brinks, to search for clues. And Bendy, who has a willing eye for blondes, redheads or brunettes, uncovers some startling evidence and some startling women—both of which Professor Caldwell uses in a neat bit of detection to trap an unexpected killer. - Summary by Handi-book Mystery Edition, Back Cover