“Infidelity Can Be Fatal” (** out of four) was a stylish but empty thriller about a private investigator (Lanie McAuley) who is hired by a sinister new client (Matthew Maccaull) and she ends up falling in love with him instead but soon begins to suspect he may be a duplicitous killer. Proficiently made and directed but undercut by its predictable script and derivative story elements. When will all these “Fatal Attraction” wannabes ever realize that without any story surprises or shock elements they have no impact?