Walking uphill in Westlake, a neighborhood just north of downtown Los Angeles, I paused at the site of the most intriguing whodunit in local lore, save the Black Dahlia case. Here, on February 1, 1922, in the living room of his duplex bungalow, one of sixteen units at the Alvarado Court Apartments, William Desmond Taylor, an Irish-born film director and former actor, was shot and killed by an unknown intruder, though a number of likely suspects have been identified by professional and armchair detectives, based partly on the eyewitness account of Faith MacLean, who, with her screen-star husband, the since-forgotten Douglas MacLean, lived next door to Taylor. Shortly before eight that night, Mrs. MacLean said, she heard what she thought might be a “muffler explosion,” and when she opened her door to investigate, she saw, standing in Taylor’s doorway, a “funny looking man” dressed “like my idea of a motion picture burglar” in a checked cap, dark suit, and “something tied around his neck.” He—or possibly she, since Mrs. MacLean later allowed that this person could have been female—seemed ready to leave through the garden courtyard that led to Alvarado Street, but he hesitated, as if “Mr. Taylor [had] spoken to him from inside the house.” Then, in perhaps the eeriest detail of the case, he met Mrs. MacLean’s gaze in the darkness. He didn’t panic or advance on her. “No,” she said, “he was the coolest thing I have ever seen,” and in that unruffled spirit he closed Taylor’s door, “then turned around and, looking at me all the time, walked down a couple of steps that go up to Mr. Taylor’s house,” disappearing in name but not deed through an alley that led to Maryland Street.