Gun Machine is a hardboiled detective thriller by English author Warren Ellis. The novel, Ellis' second, was released on 1 January 2013 through Mulholland Books, and reached The New York Times Best Seller list. It follows Detective John Tallow as he becomes involved in a mystery surrounding several unsolved homicides. Ellis intended the book to serve as a contrast to police procedurals such as CSI, which he dubbed "bedtime stories". Television rights have been sold to 20th Century Fox TV and Chernin Entertainment.