A boy and a bear go to sea, equipped with a suitcase, a comic book and a ukulele. They are only travelling a short distance and it really shouldn't take long. But their journey doesn't quite go to plan. Faced with turbulent storms, a terrifying sea monster and the rank remains of a very dangerous sandwich, the odds are against our unlikely heroes. Will the Harriet, their trusted vessel, withstand the violent lashings of the salty waves? And will anyone ever answer their message in a bottle?