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"Apple Tree Yard" is an adaptation of Louise Doughty's best-selling novel of the same name. Written by Amanda Coe, the four-part psychological thriller stars Emily Watson in the lead role as Yvonne Carmichael, a brilliant, capable and confident geneticist. She is married with two grown children and appears to have everything -- a career, a home and a loving family. However, when she meets the charming and mysterious Mark Costley, she finds herself making choices that could cost her everything that she values. Wikipedia