Marjorie Snellthorpe and her exasperating cousin-in-law, Edna Parkinton, embark on a relaxing holiday in Romania, seeking respite after their last adventure turned into a murder investigation. Reunited with Horace Tyler and befriending Frederick Mackworth, Marjorie hopes for peace. However, their tranquility is disrupted by a sextet of argumentative, irritating people, including a petulant diva.
