While back on the trail of the Swill brothers, Brisco and Bowler rescue three mail-order brides making their way to Denver who had their dowries stolen by the Swills. The Swills' newest plan is to steal a bull sent from Madrid, Spain to Madrid, CA as a token of peace and hold it for ransom.

Brisco and Bowler are invited to a gathering of bounty hunters brought together to look at new ""futuristic"" devices for law enforcement and capturing criminals. However, the bounty hunters are being picked off, ""Ten Little Indians"" style, one by one. The pair must figure out who is responsible, and how to stop them.