I read the book many many many years ago, and the movie stays mostly faithful to the book. Philip suspects Rachel of causing his cousin/guardian Ambrose’s death, but finds himself also falling in love with her. Rachel Weisz and Sam Claflin do a good job of portraying Rachel and Philip and their complex relationship. The movie may seem slow at times, but you’ll find yourself constantly wondering about Rachel’s actions. Does she have a partner-in-crime? Is she now trying to poison Philip? You’ll just have to watch the movie to figure out for yourself if Rachel is innocent or guilty.