Twelve-year-old Remy loves the traditions of Sea Gate, the island where her family spends every summer vacation, but after her grandmother and a special dog die, and her relationship with best friends Bennett and Micayla changes, Remy takes comfort in the company of the island's Dog Beach--where she hatches a plan to bring her friends closer and recapture the Sea Gate magic.

A concluding installment in the popular text-message series finds Gabby's last summer with Cece, Prianka, and Victoria upended by a food-poisoning outbreak, an all-consuming volunteer project, and a secret boyfriend.