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DSI Sarah Cavendish

The definition of a high flyer, Sarah has reached the level of Detective Superintendent by her early 30s.

However her career came to an abrupt halt when a counter-terrorism operation she was leading went wrong. As the scapegoat, Sarah has now been assigned to the Cold Case Unit where she is expected to lie low. Boyd isn't given any choice about Sarah and although he doesn't know exactly what happened, he can see that she has physical and mental scars from the incident. As a result of this experience, Sarah has learned to always play by the rules, but this puts her at odds with some of Boyd's less than orthodox methods in getting results.

Eva Birthistle

Eva Birthistle trained first at the Performing Arts in Derry and then The Gaiety School of Acting for two years. She has since gone on to appear in a long list of films including , alongside George Clooney, , Middletown with Matthew Macfadyen, and Ken Loach's , for which she received numerous Best Actress nominations. She has also appeared in many well known television dramas such as In Deep, , Strickland, , , , , , and . She has joined the cast of for this ninth and final series.