The San Tomas river is in flood and a mixed bunch of travellers are forced to stay in the decaying township of Red Rock Crossing. There is Jesse Grant a once-successful rancher who is fleeing his enemies the Santos brothers. Then, there are Ben and Marty, a pair of Texas Rangers escorting Hamel, a captured outlaw. A hired assassin named Missouri Sam is also waiting to ply his murderous trade and only one man knows his identity. Ben and his girl Jane, who lives at the crossing, find themselves engaged in a struggle for survival as the town erupts in murder and violence. At last, the flood subsides but a mystery must still be unravelled before Missouri pays for his crimes.