Becket Rumsey is all at sea. His dad has run away with him and his brother Billy in the middle of the night. And they've left everything behind, including their almost-mum, Pearl. Becket has no idea what's going on - it's a mystery. So with the help of Billy and a snail called Brian, Becket sets out on a journey of discovery. It's not plain sailing, but then what journeys ever are?