Finding Serenity: Anti-heroes, Lost Shepherds and Space Hookers in Joss Whedon's Firefly is an unlicensed and unapproved collection of essays on Firefly edited by Jane Espenson with Glenn Yeffeth. The book was released in late 2004 following the cancellation of the series. Jane Espenson was a writer for the show and the book contains a series of essays that discuss the show from a variety of viewpoints, some scholarly in tone, others more humorous.