Araminta Spook lives in a haunted house, but the ghosts are her friends. And her favourite ghost is Sir Horace and she wants to buy him something special for his birthday. But what do you buy someone with no hobbies, or body, for their 500th birthday? Araminta comes up with an idea for the best present ever ... but it lands her in very deep water. Will she have time to organise a party, or even see Horace or her family ever again?