Set sail aboard the Plucky Leopard for an adventure of myth and marvel among the ice-caps!

Curious, pin-bright Oona Britt dreams of a life of excitement on the wild waves. She has read stories of a mysterious, magical creature called the nardoo which swims through the stars at night, and decides to stow away on her father's ship to track one down.

But her time on the storm-tossed sea is fraught with danger - there's a mutinous crew, a sabotaging ship's cat called Barnacles and a hungry creature of the deep awoken after a long sleep...