In Ghosts, when the body of a university student is found dumped in a ravine, his friends claim he was a model undergraduate. But detectives Annie and Ken soon discover that he had a double life manufacturing ecstasy. Helen's world is turned upside down when she realises her former lover, an undercover police officer, is following their main suspect. She is horrified when an angry Banks tells her that this man may be behind the murder. Helen sets out to learn the truth and discovers the dead boy is actually the officer's son. Banks and Helen must find him before he exacts revenge on the real killer.