Connor and Grace are twins, recently orphaned after their widowed father's death. Rather than being adopted by the town's busy-bodies, they decide to set sail for new pastures in their father's last single possession, his sailing boat. But a vicious storm sees their boat capsize and the twins separated. Two mysterious ships sail to their rescue - each picking up one twin before disappearing into the mist. Connor wakes to find himself on a pirate ship and is soon being trained up with a cutlass. Meanwhile Grace finds herself locked in a darkened room, as the vampirates await nightfall...Determined to find each other, yet intrigued by their new shipmates, the twins are about to embark on the biggest adventure of their life...