Original 1951 German A1 theatrical poster for Hinter den Mauern des Grauens (The Strange Door), a Universal Pictures gothic thriller directed by Joseph Pevney. Starring Charles Laughton, Boris Karloff, and Sally Forrest, the film is part of Universal’s classic horror cycle of the early 1950s. German paper on this title is scarce and highly desirable, offering striking design and strong inks that showcase Universal’s atmospheric horror style of the period.