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Cass is adopted. She's always been happy in her new family, getting on well with her parents and feeling protective of their natural son Ben. So when her father, a high-ranking MP, is revealed to be having an affair with a woman not much older than her the betrayal hits her hard. Aidan, her brother, manages to get back in touch with her shortly afterwards and seems to be the bright spot in her life. But how much do these siblings really know about each other?