From the back of the adventure:
"Happy Holidays, Pardners!
Welcome to Christmas in the Weird West!
Ronan Lynch, Bad Luck Betty, and Velvet Van Helter had no idea what they were up against when they took on a job to free a rich man's son from the religious cult he'd joined. It all seemed simple enough: just get the kid home to his father in time for Christmas. Little did they know they'd become embroiled in an intricate web woven by an ancient evil, one that would cost one member of their impromptu trio his very life.
Dead's a lousy way to spend Christmas."