Five novels based on bonkers things that actually happened

Jeff Somers is the author of Lifers, the Avery Cates series from Orbit Books, Chum from Tyrus Books, and We Are Not Good People from Pocket/Gallery. He has published over thirty short stories as well. One of Somers's five top novels based on incredible, unbelievable things that actually happened, as shared at B & N Reads:
Psycho, by Robert Bloch

Although Hitchcock’s film adaptation has