Jenny Larson a friend of Mac and Jack Dalton, who breeds race horses along with her father, calls Mac when her father is killed when a horse trampled him. The police rule it an accident but the daughter doesn't believe it. She tells them that someone named George Henderson wants to buy the farm and her father wouldn't sell. She then shows them something they found. Mac turns it on and discovers it's an ultrasonic device that drives horses mad. They later learn from Pete that Henderson is a money launderer. They later learn from the Feds that Henderson is probably working for a drug dealer who ran off with money that was used to lure him out only he got away with it. So he tasked Henderson with laundering it. And he launders it by using the device to drive other horses off their game when they running so that his horse which is deaf can win. Which is why he wants the farm. So Mac, Jack and Pete try to run an operation to get him to admit he killed her father. Jack poses as the drug dealer who tells Henderson he's moving too slow and that he knows someone else who can do it faster. Pete pretends to be the man and Mac is his tech guy.
—rcs0411@yahoo.com