Lean Mean Thirteen is a 2007 novel by Janet Evanovich, the thirteenth in the Stephanie Plum series. It was released on June 19, 2007. The novel marks another thematic shift in the series; the first through seventh novels focus on Stephanie learning her trade as a bounty hunter, and the travails that come as she tries to apprehend a particular fugitive. The eighth through twelfth novels feature Stephanie coping with being stalked by criminals for various reasons; Lean Mean Thirteen, and several of the subsequent novels, focus on Stephanie getting caught up in the search for a missing person, in a manner related only peripherally, or not at all, to her work as a fugitive apprehension agent. Source: Wikipedia (en)