New York City, the early 30's. A man is poisoned on a crowded streetcar during rush hour. Everyone saw him die, but no one saw the killer! And far too many people had good reason to hate Longstreet.

Sheila, exotic young international leader of haute couture,is found murdered in her Park Avenue penthouse. Two floors down, the distinguished middle-aged millionaire—Ashton McKell—is hauled off to jail. Next to go, Lutecia, his shy patrician wife. And then—Dane, their handsome, sensitive son. Together, a triangle of murder suspects. Ellery Queen, immobilized, can trick the police into becoming his 'legmen' if he discovers The Fourth Side of the Triangle.Written by Avram Davidson

While stranded in the desert, Ellery Queen stumbles across a religious cultIt’s 1943, the war is raging, and sleuthing scribe Ellery Queen wants to do his bit. After a tortuous cross-country drive, he takes a job writing scripts for a Hollywood propaganda house—twelve hours a day of hack work that quickly turns his mind to jelly. After a few weeks, he is so worn down that he can type nothing but gibberish, and he decides to drive home. The trouble starts as soon as he reaches the desert.His ancient roadster breaks down on the edge of Death Valley. Wandering in search of help, he is saved by a man known as the Teacher, who takes him to an oasis called Quenan. Here, Queen finds a bizarre, reclusive cult that seems to have come straight out of the ancient past. A murder has been committed in the desert, and the Quenanites plan on delivering some Old Testament justice. Queen is just the detective they’ve been waiting for. Wrtitten by Avram Davidson