<P> In September 2015, it was announced Rachel Weisz was in talks to star in the film . She took the role, and envisioned the character as "sexually liberated". That same month, Sam Claflin joined the cast, stating he was interested because Philip was an ordinary, immature character, who was virginal until discovering Rachel . </P> <P> In February 2016, Holliday Grainger joined the cast, followed by Iain Glen in March . Glen said that when he received the screenplay, he could see Michell had structured the mystery so that Kendall would believe one thing until another piece of evidence arose, and developed his performance accordingly . </P> <P> Principal photography began on 4 April 2016, and lasted through the spring in England and Italy . With production designer Alice Normington, Michell selected filming locations in South Devon, Oxfordshire and Surrey, combining shots to create an idealistic setting . In Surrey, photography took place at West Horsley Place, a 16th century building owned by Bamber Gascoigne . Michell said they selected the house for "the spirit of the place", which he described as "so alive and raw". Flete Estate, Devon was used for beach and riding scenes and shots of cliffs . </P> <P> Weisz was costumed by Dinah Collin, who aimed for a fashion foreign to Cornwall, and consulted portraits to create an authentic classy appearance . The pearls used in the story were also made for the film, based on an 1835 painting . The crew decided on only two main dresses for the Rachel character, since she was not at home in Cornwall . </P>

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