The girls arrive at Carson Estate for a weeklong stay with Ken's wealthy aunt. But on their very first night, a prized horse and saddle go missing.

The teen detectives split up into three different groups: one to find Pepper, one to track down Dietrich, and one to keep an eye on Giovanni.

With the competition looming and Pepper still on the loose, the Carsons need another horse — and someone to ride her. The gang sets a trap for Giovanni.

The Barbies have a plan to rescue the horses, recover the saddle and win the championship, too. But it'll take everyone on the team to pull it off!