Heather Parker is determined to give her daughters the life she never had - starting with horses. She signs them up for riding lessons at Rancho Santa Fe Equestrian, where horses are a lifestyle. Heather becomes a "Barn Mom," part of a group of wealthy women who hang at the stables, drink wine, and prepare their daughters for competition. It's not long before the Parker family is fully enmeshed in the horse world. With the end of summer show fast approaching, the pressure is on, and these mothers will stop at nothing to give their daughters everything they deserve. Before the summer is over, lies will turn lethal, accidents will happen, and someone will end up dead.