Rex Graves and his new wife, Helen, attend the opening night of a play in which five famous literary sleuths of a bygone era are invited to Pinegrove Hall to solve the mystery of a missing heirloom. When the heroine meets with a sinister end, the audience applauds, unaware the real drama has only just begun. Rex, a Scottish barrister and private detective, is called upon to help discover who among the cast and crew staged the death of the beautiful young actress. But this challenging mystery has many complications waiting in the wings, and Rex must use all his skills to unmask the true culprit.