If you're referring to E. Phillips Oppenheim, he was a prolific British author who wrote primarily in the genres of mystery, thriller, and espionage. He was known for his suspenseful plots and fast-paced narratives.
Here are some of his most popular works:
* The Great Impersonation (1920)
* The Mystery of the Blue Train (1928)
* The Lost Mr. Linthwaite (1935)
* The Man from Sing Sing (1940)
* The Last Train to Berlin (1941)
Oppenheim wrote over 100 novels and numerous short stories, many of which were adapted for film and television.