Bat is hired by John Conant to discover if his daughter's fiancée cheats at cards. Bat discovers the crooked card sharp is really a powerful cattle baron who plans to kill Bat before he can tell anyone else.

Bat recommends himself to be a wagon guide to cross the desert after a wagon guide is brought in dead with bullets in him. Three wagon trains have been lost that summer to a trail pirate. The woman leading the next train doesn't trust Bat.