A model is dead in Central Park, and the only witness to the crime is a horse named Siwash. The evening's party is over, and modeling sensation Violet Feverel wants to get in a quick horse ride before the dawn breaks. She saddles up Siwash the stallion, and gallops onto the Central Park bridle path, eager to begin what will be the last ride of her life. On the other side of the park, Miss Hildegarde Withers - schoolmarm and expert sleuth - breaks into a grin when she hears a patrolman's radio