On a dark and foggy night, charming amateur sleuth Ellie Haskell, her husband Ben, and her plucky sidekick Mrs. Malloy find themselves stranded at a grand estate on the Yorkshire moors. Lord Belfrey of Mucklesfeld Manor has decided to save his crumbling establishment by offering himself as the prize on a TV reality show titled 'Here Comes the Bride.' Thrilled at the prospect of marrying a lord, Mrs. Malloy eagerly joins the competition. After one of the potential brides is shot during an archery contest, Ellie begins to explore the dark passageways and hidden nooks of the delightfully Gothic estate – but she may not be prepared for the secrets lurking behind closed doors.