Enter a Murderer
 |
 First edition | |
| Author | Ngaio Marsh |
|---|---|
| Language | English |
| Series | Roderick Alleyn |
| Genre | Detective fiction |
| Publisher | Geoffrey Bles |
Publication date | 1935 |
| Media type | Print () |
| Preceded by | A Man Lay Dead |
| Followed by | The Nursing Home Murder |
Enter a Murderer is a detective novel by Ngaio Marsh; it is the second novel to feature Roderick Alleyn, and was first published in 1935. The novel is the first of the theatrical novels for which Marsh was to become famous, taking its title from a line of stage direction in Macbeth, and the plot concerns the on-stage murder of an actor who has managed to antagonize nearly every member of the cast and crew. Unfortunately for the murderer, Inspector Alleyn is in the audience.