Behind Locked Doors has a plot that may have seemed familiar to some moviegoers when they saw Sam Fuller's 1963 thriller, Shock Corridor. In 1948's Behind Locked Doors, a newspaper reporter (played by a non-dancing Lucille Bremer), is hot on the story of a corrupt judge who's on the run. She believes he's hiding out in a mental institution and dodging the law by pretending to be crazy. She hires a private eye to pose as her husband and become an institution patient so he can bust the crime from the inside. Yes, there are shady staff members running the asylum. And, yes, the private eye falls for the gorgeous reporter.
In Shock Corridor, a journalist hungry to win a Pulitzer Prize gets himself committed to mental institution and pretends to be crazy so he can solve an odd murder case from the inside.
For hardcore classic film fans, you look at Behind Locked Doors as being "Six Degrees of An A-List MGM Musical." Four of the actors were in top MGM musicals. Richard Carlson, at far right in the black and white photo, played opposite Judy Garland Presenting Lily Mars (1943).
As for Behind Locked Doors, keep it in mind. It's a brisk little crime drama. Try YouTube.