The Drop is the 24th novel written by Michael Connelly, and the fifteenth novel featuring Los Angeles Police Department detective Harry Bosch. The book was published on 22 November 2011. The novel was referenced in an October 2010 interview, in which Connelly indicated that he'd like to release "'bookend' novels next year, the second one a Bosch book." Connelly's first novel of 2011 was the Mickey Haller novel The Fifth Witness, released in April, meaning that his 15th Bosch book would be released in the Fall of the year.