Gracie Miller is a small-town girl who has landed her dream job in New York City. As jewelry designer for one of the most prestigious jewelers in the world, she completed a particularly stunning piece, a custom setting for a large diamond. But when her billionaire client Mrs. Katsaros comes to have a minor issue with the setting repaired, Gracie is horrified to realize it is not the ring she created. Someone has forged her design, and the priceless diamond is gone.
Mrs. Katsaros has no desire to bring media attention to the jewelry heist, so she recruits her nephew, Quinn, and his FBI agent friend, Steve, to do some sleuthing off the record. When they discover that the missing ring is just one of many forgeries in the widow's collection, they look to Gracie for help. They need her to act the part of Quinn's fiancée. From the lights of New York to the shimmering islands of the Mediterranean, Gracie is swept into a thrilling hunt. But amid the search for the elusive thief, she and Quinn find themselves increasingly distracted by their growing feelings for each other. What neither realizes is how close the danger lies and how serious the vendetta is—because, apparently, it is worth killing for.