When her big sister Violet has friend trouble at school, Dory tries to come to her rescue. But, of course, Dory's active imagination takes over, and Dory's suddenly sure that Violet's problem involves pirates--and Violet's lost friendship bracelet is hidden treasure. When Dory sets sail to recover the treasure, she has to navigate rocky waters without her imaginary friend Mary, who has gone off on vacation with an exciting new friend of her own.