Casey is commissioned by the Mexican government to carry a special shipment of Emperor Maximilian's crown jewels to St. Louis but the Secret Service agent guarding it on the Cannonball Express is an impostor planning to steal the treasure.
Casey is commissioned by the Mexican government to carry a special shipment of Emperor Maximilian's crown jewels to St. Louis but the Secret Service agent guarding it on the Cannonball Express is an impostor planning to steal the treasure.
