Mr. Mercedes is a novel by Stephen King. He calls it his first hard-boiled detective book. It was published on June 3, 2014.[1] On June 10, 2014 the author described Mr. Mercedes on Twitter as the first volume of a projected trilogy, to be followed in the first half of 2015 by Finders Keepers, the first draft of which was finished around the time Mr. Mercedes was published,[2][3] and End of Watch.