Private Investigator Regan Reilly and her husband, Jack, head of the Major Case Squad in New York City, have just gotten hitched! They've headed to Hennessy Castle, a romantic spot in western Ireland -- seemingly the perfect place to escape the world and the criminals they deal with daily -- to begin their lives together. But Hennessy Castle is hardly relaxing! Their first afternoon in Ireland, Regan and Jack go out for a jog, stopping at an old graveyard at the edge of town. The first tombstone they see is marked REILLY. Turns out May Reilly, who died in 1822, was a talented lacemaker who made an exquisite tablecloth for a banquet at Hennessy Castle but was never paid. Legend has it that May has haunted the castle ever since.