Marty is missing! The Beacon Street Girls begin a desperate search to find their beloved doggie mascot. At the same time, Katani's sister Kelley has become involved with a therapeutic riding program for children with autism, but the riding stable is in danger of closing. When a famous Red Sox player reports that he has found Marty and will pay the BSG $10,000 to keep his lucky charm, the Beacon Street Girls are faced with an extremely difficult dilemma. In Lucky Charm, the Beacon Street Girls weigh the importance of helping a good cause versus getting their beloved pet back.