In the first book of the series, Firefly: Big Damn Hero we got a glimpse of Shepherd Book's mysterious background before he became a man of the cloth, and this time around we get a lot more than just a glimpse of the past of the man they call Jayne. Jayne's past catches up to him when an old flame, Temperance. reaches out to him in dire need of assistance. Her small town on a dusty planet in the middle of nowhere is under threat from a band of thugs and she is desperate enough to reach out to Jayne even though they didn't part on good terms. This does sound like a job for Jayne but he also knows he can't go it alone so the entire crew winds up risking their lives for someone they don't even know. Not to mention this isn't even a paying gig.
Firefly: The Magnificent Nine - more trouble in the Verse