Bat is hired to join a man in jail to gain his confidence and help him escape. The hope is the man will lead Bat to a string of black pearls he stole a train's express box. Bat's job is complicated when the man's sister shows up.
Bat is in Pine Junction, California in the employ of Gen. Zachary Moran who is paying Bat $5000. Bat has finished a sumptuous meal provided by Moran's private chef when the Sheriff enters. He is arrested for cheating at cards and thrown into a jail cell with notorious train robber Polk Otis. This is a ruse to give Poke Otis the idea that Bat is a criminal. Bat helps Polk free himself from his shackles with a hidden file and kills the sheriff in order to escape - but it's all part of a plan he's worked out with the lawman to recover a priceless necklace of black pearls Polk and his gang have stolen from a train's express box. Moran was taking the pearls to San Francisco for his friend Lotta Crabtree to wear at the opera opening. In freeing himself, Polk reopens a gunshot wound. They make it out of town but they have to stop. Bat leaves for supplies and a wagon meeting a woman looking for a guide but he refuses. When he returns to Polk, she follows as she is Polk's sister but not ... Written by