On the high seas of the Caribbean, a family of English children is set loose - sent by their parents from their home in Jamaica to receive the civilising effects of England. When their ship is captured by pirates, the thrilling cruise continues as the children transfer their affections from one batch of sailors to another. Innocence is their protection, but as life in the care of pirates reveals its dangers, the events which unfold begin to take on a savagely detached quality.