Tip on a Sure Thing

When a race between two horses is being highly touted the press is giving a lot of coverage to the underdog. And everyone seems to be betting on that horse. So a bookie takes all of the action and decides to ensure that the other horse will win. So he kidnaps the son of the underdog horse's jockey. The jockey's wife then calls McCall who advises them to call the police but the man refuses to do that. So McCall turns to an agent who is a gambler to help him find out who kidnapped the boy before the race begins.