Given the question: Build a movie plot around this: What is the boat doing at the end of the movie? Harry unsuccessfully tries to steer the boat which is now travelling in circles.
The answer is:
Harry Moseby (Gene Hackman) is a retired professional football player now working as a private investigator in Los Angeles. He discovers that his wife Ellen (Susan Clark) is having an affair with a man named Marty Heller (Harris Yulin).Aging actress Arlene Iverson (Janet Ward) hires Harry to find her 16-year-old daughter Delly Grastner (Melanie Griffith). Arlene's only source of income is her daughter's trust-fund, but it requires Delly to be living with her. Arlene gives Harry the name of one of Delly's friends in L.A., a mechanic called Quentin (James Woods). Quentin tells Harry that he last saw Delly at a New Mexico film location, where she started flirting with one of Arlene's old flames, stuntman Marv Ellman (Anthony Costello). Harry realises that the injuries to Quentin's face are from fighting the stuntman and sympathises with his bitterness towards Delly. He travels to the film location and talks to Marv and stunt coordinator, Joey Ziegler (Edward Binns). Before returning to L.A., Harry is surprised to see Quentin working on Marv's stunt plane.Harry suspects that Delly may be trying to seduce her mother's ex-lovers and travels to the Florida Keys, where her stepfather Tom Iverson (John Crawford) lives. In Florida, Harry finds Delly staying with Tom and a woman named Paula (Jennifer Warren). Harry, Paula and Delly take a boat trip to go swimming, but Delly becomes distraught when she finds the submerged wreckage of a small plane with the decomposing body of the pilot inside. Paula marks the spot with a buoy and when they return to shore, she appears to report the find to the Coast Guard.Harry persuades Delly to return to her mother in California. After he drops her off at her California home, he still is uneasy about the case, but focuses on patching up his own marriage. But then he learns that Delly has been killed in a car accident on the set of a movie.Harry questions the driver of the car, Joey, who was injured. Joey lets him view footage of the crash, which raises Harry's suspicions about...