Newbery Medal winner Cynthia Rylant pens the enchanting tale of Whistler and Lila's adventures during the low tide of the full moon. The mice children set off to meet new creatures before the tide comes back in and washes the creatures back to sea. Suddenly, a young octopus named Cleo startles the children, but the three soon become good friends. Yet as the tide comes back in, Lila discovers her feet are stuck in the mud. Will Cleo be able to help her in time and save the day? "Rylant has that rare power to write about happiness without being overly sentimental ..." -Booklist