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When the Widdershins sisters and Granny are called away in deepest winter to look after cousin Clarissa, it doesn't take long for adventure - or trouble - to find them. The town of Little Nipping has plenty to explore with its frozen lake and winter market, as well as being haunted by a doomed highwayman, searching for lost treasure. But the legends are true and seeing a ghostly figure one night, the girls realise that Granny is in terrible danger. As an icy storm rages, the race to save her begins - can they reach the treasure before the highwayman claims another soul?