By Dan Mitrione. Per Google Books, "Dan Mitrione, a former investigator with the Federal Bureau of Investigation, is the author of Suddenly Gone: The Kansas Murders of Serial Killer Richard Grissom. The book chronicles the true story of the hunt for Grissom, a terrifying killer who tortured and murdered four young women in Wichita and Kansas City, Kans. in 1989," so evidently this one had a different subtitle in hardcover.
This paperback is a bit frumpy -- edgewear, cracked and leaning spine, stamps from previous shops -- but is a bit harder to find than you'd think.