The Angels are assigned to this case because their client's father was murdered. She stated her father knew each horse that raced and before his death he wrote on a piece of paper the marking of Predition.
The Angels are able to discover that the stableman made a switch with a twin of Predition. The horse that would win the race.
Kris and Bosely are able to track down the real Predition and return him to the race track without the suspects knowing it.
The suspects bet a lot of money of Predition. The horse loss the race and the Angels and two additional detectives were their to apprehend the stableman and the crooked gamblers.
I love the way Bosely and Kris made the switch and then the Angels were ready to apprehend the criminals right after the race.