Allingham (Margery) Deadly Duo.

Wanted: someone innocent/Last Act.
New York, Walter J. Black, A Crime Club Selection, 1949

First edition, first printing. 8vo. Original boards. Dust-jacket.

Two novellas by this renowned author from the Golden Age of Detective Fiction, best remembered for her hero, the gentleman sleuth Albert Campion. This edition preceded the UK version, titled Take Two at Bedtime.