Great mysteries aren’t only about solving the murder. They usually involve the main character learning intimate details about suspects, figuring out their relationships, and gradually connecting the dots between them (typically through finding clues) until finally reaching a conclusion. The problem with “A Haunting in Venice,” however, is that none of the present suspects are particularly interesting and their relationships to each other aren’t compelling or adequately explored.
This is mostly because the film tends to dial in on the…