87 mins | Crime, TV Movie | Dec. 5, 1967
87 mins | Crime, TV Movie | Dec. 5, 1967
| Producers | HR |
| Original title | Ein Fremder klopft an |
| Directors | Kurt Früh |
| Writers | Agatha Christie |
as Dr. Gribble
as Hodgson
as Tante Loo-Loo
as Cecily
as Bruce
as Lisa