The heroes square off against a band of five masked outlaws with a terrible secret hidden beneath their hoods.
From the introduction:
The group has stopped for a spell in the small, friendly town of Blue Springs, Nebraska. It is late afternoon and all is quiet as they sip drinks and pick at the remains of a home-cooked meal in the Shining Star Saloon on Broad Street. An elderly black man tickles the ivories of an out-of-tune piano, and a few small groups of locals murmur and laugh nearby.