The play focuses on two half-sisters, Jackie and Mary, who inherit a stamp collection from Mary’s grandfather which might be worth a fortune. The title refers to the "
Blue Mauritius", one of the world's rarest stamps. The sisters become involved with three men, including Phillip, the owner of a stamp store, and Dennis, whose occupation is somewhat mysterious. The characters try to out-do each other in attempting to reap possible rewards from the stamp collection. ==Cast and characters ==