Build a movie plot around this: What profession does Mary Briggs impersonate when undercover? tennis instructor
Answer:
In 1942, a 10-year-old named Timmy plays with a jigsaw puzzle of a nude woman when his mother walks in and chastises him for it. After she orders him to get a plastic bag, he returns with an axe and murders her, then saws her body with a hacksaw. When the police arrive, they find him hidding inside a closet and Timmy acts as if he was a witness of the crime scene. The police believe this, not suspecting him as the murderer, and is sent to live with his aunt. Forty years later, an black-clad figure opens a box containing the bloodied clothing and a photograph of Timmy's Mother. He also unboxes the bloodied jigsaw puzzle and starts to put it together.Meanwhile, as a nearby girl studies outside in broad daylight, she is decapitated with a chainsaw by the unidentified killer and steals her head just before Lt. Bracken and his partner Sgt. Holden arrive to investigate the murder. After the detectives explain to the college's Dean that there were no witnesses or suspect, the Dean asks the rather sinister Professor Brown (Jack Taylor), who teaches anatomy, to show the detectives around. Outside, the groundskeeper named Willard (Paul Smith) is seen trimming a hedge with a chainsaw, similar to the killer's. In the campus' library, a student named Kendall receives a note given by a girl to come to the pool later; the killer finds it and tracks down the girl at the swimming pool, where she is brutally sawed with the chainsaw. A little later, Willard arrives on the scene and is arrested, believing to be a suspect. Near the pool, they find the chainsaw and the girl's body parts, with the exception being her torso is missing.The next day, Dr. Jennings meets with Kendall at the station in hopes that Kendall can help provide a profile of the murderer. Lt. Bracken brings in an undercover cop named Mary Riggs, who was also a former tennis player. Bracken explains to Holden that Mary is going undercover to pose as a tennis instructor at the college, and Kendall is going to assist her whenever he can. As a reporter named...