Shetland (2013– )
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Cassie is the (blood) daughter of Duncan and Fran. They split up when Cassie was very young, and Fran began seeing Jimmy Perez. Upon Fran's death, she left Cassie in Jimmy's custody to raise. After Fran's death, Jimmy and Duncan became closer, creating a sort of estranged friendship between the two men which makes for an interesting dynamic through the show. Fran had not married Duncan, nor Jimmy.
Fran and Jimmy were married and she died prior to season 1 in the TV Show. In the book Framn was killed during the murder investigation on Fair Isle (the episode on Fair Isle where the famous bird water was killed and there were 2 teens Joe and Angus similar but not the same as the book. Cassie is also younger in the books around 5-7 years old Edit