Two-way murder

It is a dark and misty night - isn't it always? - and bachelors Nicholas and Ian are driving to the ball at Fordings, a beautiful concert hall in the countryside. There waits the charming Dilys Maine, and a party buzzing with rumours of one Rosemary Reeve who disappeared on the eve of this event the previous year, not found to this day. With thoughts of mysterious case ringing in their ears, Dilys and Nicholas strike a stranger on the drive back home, launching a new investigation and unwittingly reviving the search for what really became of Rosemary Reeve.