The Jolley-Rogers have traded in the high seas for suburban life. Meet the Jolley-Rogers - a pirate family who is moving to Dull-on-Sea, a quiet seaside town, while they fix up their ship. This unusual family soon has the whole neighborhood gossiping. Defying the grown-ups, Matilda becomes friends with young pirate Jim Lad. When the JolleyRogers return to sea, the town realizes that they were wrong to assume the worst when it is discovered that the pirates have buried treasure in everyone's yard. The neighbors are thrilled, but Matilda is sad to have lost her new friend, until she discovers her own treasure - a pen pal!