The Case of the Weird Sisters
| Author | Charlotte Armstrong |
|---|---|
| Language | English |
| Series | MacDougal Duff |
| Genre | Mystery |
| Publisher | Coward-McCann |
Publication date | 1943 |
| Publication place | United States |
| Media type | |
| Preceded by | Lay On, Mac Duff! |
| Followed by | The Innocent Flower |
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.