On a day trip to the seaside, Mom and Dad settle down in their deck chairs to snooze the day away, while for Shirley, it’s a chance to set sail for uncharted seas. "Come away from the water, Shirley," caution her parents. But Shirley has already set out on an adventure, where she encounters danger, pirates, and buried treasure! John Burningham’s brilliant juxtaposition of both sides of the story will have children and parents laughing aloud.