Private investigator Regan Reilly and her new husband John, head of the New York Police Department's Major Cases Unit, go on a honeymoon to Ireland. They arrive at the ancient Hennessey Castle, where, according to legend, a ghost lives. By an amazing coincidence, this is the spirit of their namesake, the lacemaker May Reilly, who wove a beautiful lace tablecloth for the owner of the castle, but did not receive the promised reward. Before Regan and John can see this marvelous work of art, it disappears. Who, if not them, can find him?