In the early days of the old west, when St Joe was the jumping off place for the big wagons rolling west, a man named Cheyenne Adams saw a chance to get rich. But his scheme involved much more than robbery - it called for mass murder, for Cheyenne Adams was a savage killer, with the nerve ends buried deep within his hulking body. As our story opens, the Cisco Kid and Pancho are talking with a territorial marshall in a St Joe cafe. Fifteen wagon trains have gone missing, with not a trace of them to be found anywhere....