Mr Campion & Others, Paperback/Margery Allingham

In this miscellany of villainy, our unconventional sleuth must contend with misbehaving debutantes, sinister smuggling rings, a Dowager Countess who's not all that she seems, an SOS message daubed in lipstick, a beleaguered New York socialite, and an elderly Egyptologist indulging in some bad behaviour...