Melanie Trenholm’s husband, Jack, has asked for a separation. But their relationship issues are pushed aside when longtime nemesis Marc Longo comes to them with a proposition: allow their Tradd Street house to be used as the filming location for the movie adaptation of Marc’s bestselling book, and he will help Jack reestablish his stalled writing career. Despite Melanie’s hesitation, Jack jumps at the chance. But Melanie’s doubts soon prove to be well founded when she uncovers ulterior reasons for Marc wanting to be back in their house --- reasons that include a hidden gem so brilliant that legend links it to the most infamous jewel of all, the Hope Diamond.