The Unseen(1945)

David Fielding, who has recently lost his wife, moves into a new neighborhood under a cloud of suspicion. Many feel that his wife's death in a car crash was no accident. Elizabeth Howard, the governess he hires to look after his children, makes it her mission to find out the truth. When other murders seem to be following David to his new town, Elizabeth investigates with the help of David's son Barnaby.