- HD 1080
- Runtime: 70m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Irvin Willat
- Stars: Hobart Bosworth, Jane Novak, Wallace Beery, James Gordon, Richard Wayne
- keywords: revenge, silent film
- Production_studio: Paramount Pictures, Thomas H. Ince Corporation
- Slogan: Vengeance! Deep as the Ocean!
- The Behind the Door is featured in the top rankings of 1919
- #2 in Top Romance Movies of 1919
- #3 in Top Drama Movies of 1919
- #2 in Top War Movies of 1919
Oscar Krug is looked upon with suspicion by his neighbors because of his German name. When the US is drawn into the war with Germany, he enlists and travels the seas with his wife, Alice Morse. During a submarine attack Alice is snatched from Krug's side by a German officer. Krug now lives to have his revenge, and when the opportunity presents itself, he will have it.