The Case of the Weird Sisters

The Case of the Weird Sisters is a 1943 mystery thriller novel by the American writer Charlotte Armstrong. It was first published in New York by Coward-McCann, an imprint of Putnam. It was the second in a trilogy featuring amateur detective MacDougal Duff, preceded by Lay On, Mac Duff! and followed by The Innocent Flower.

Adaptation
In 1948 it was adapted into the British film The Three Weird Sisters directed by Daniel Birt and starring Nancy Price, Raymond Lovell and Nova Pilbeam. Produced by British National Films, it shifted the setting from America to Wales and removed the character of MacDougal Duff.