John who? It all began simply enough, God knows. Mary Hazelwood suddenly decided to go away for the weekend and left a note for her sister Susie, with whom she shared an apartment, that she was off for Los Angeles and that John was driving her to the airport. It was only when she didn’t return that the problem arose. John, obviously, had been the last person known to have seen Mary. But the difficulty was that Mary knew four different men named John, and each of them denied even having seen her that day. Which John? Susie hadn’t a clue. And when she turned for help to a young professor named Mervyn Gray, who was half in love with her sister, he found a very disturbing warning in his mailbox. In block letters sprawling across a torn sheet of cheap note paper was this terse message — Confess or tomorrow you die!