Ted McKeever and Jim Buckley answer the "Mayday" of a gangster when the fugitive's plane makes a forced landing near the Mexican border. Gangster Louis Santee and his wife are fleeing toward the Mexican border one jump ahead of Senate investigators.

McKeever end Buckley make a strange venture into the the desert. Even geiger-counters can sometimes be misleading. Ted and Jim do their best to convince two uranium prospectors that they have not struck lucky.