When Cassie was little her grandmother would tell her stories about the Arctic...stories about snow and ice, about a beautiful castle made of ice, and about her mother, who made a deal with the Polar Bear King and was swept away to the ends of the earth to become a prisoner of the trolls. Cassie is older now and has no time for fairytales and talking animals, or lies about her dead mother. Living with her father at the Arctic research centre, she is determined to become a leading scientist and researcher. But when Cassie comes face to face with a mysterious polar bear, one that defies all scientific fact or knowledge, she begins realise that the fairytales could actually be true. Armed with the knowledge that her mother might be alive, Cassie makes a deal with the Polar Bear King, and embarks on a dangerous journey against time to save her. But her agreement with the Polar Bear King comes with consequences she never bargained for, and before her journey's end Cassie will discover the true meaning of love and family, and loss. A compelling romantic fantasy set in the beautiful frozen Arctic.