The Missing Sister (2019)

Rural municipal councilman Dev is the perfect fiance for doctor Sharon. Learning she lost her still-missing elder sister Raven when aged four, he gets his cousin, police detective Frank, to help search for her. They find the perfect suspect nearby, single Collette, who claims to have let their mother unable to deal with stepfather, and is eager to move back in the parental home. Sharon dismisses Dev's due questions and worries as the pretender doesn't quit fit as jealousy, although her best friend Jill gets even more suspicious. When Dev works out it's an impostor and demands a meeting to give her marching orders, she leaves him for shot dead, confident she can get half of the house's value while convincing Sharon to sell. Frank slowly pieces the puzzle together as more violent crimes tie in.