When Hugh Blaine bets $50,000 that all four hooves of a racehorse are off the ground at once, he agrees to pay Bat 10% of the bet to supply proof. Bat hires a man to take photographs of the trotter in action, but the pictures are stolen.
In Tucson, Arizona after winning a sulky horse race Bat is approached by Roger Purcell and Hugh Blaine who have made a bet for $50,000 over whether all four hooves of a trotter are off the ground at once. Blaine has three days to prove it true. Lost for a way to prove it, Blaine offers Bat ten percent if he can prove his side. Bat tries various experts but when he receives a victory photo from the race, he realizes a camera might catch the proof. He talks to the photographer Casey who says a camera might catch it but one camera might take a long time. Bat suggests they try ten cameras. Meanwhile, Purcell is summoned by Billie Tuesday to whom he owes $50,000. She offers to cover his debts if he marries her. When Purcell learns what Bat is up to, he sends his henchmen to steal the plates but they fail. He then talks Billie into stealing the plates from the photographer. However, Bat finds Casey shot by Billie setting up a confrontation between Bat, Billie, and Purcell that does not go ... Written by