Mark Stevens as Brad Galt, an embittered ex-convict who returns to the private detective business upon his release. Sour and surly, Galt behaves himself only when he's around his faithful and adoring secretary Kathleen (Lucille Ball).
When Galt's crooked former partner Tony Jardine (Kurt Krueger) inaugurates an affair with socialite Mari Cathcard (Cathy Down), Cathcard's waspish art-collector husband (Clifton Webb) arranges Jardine's murder, carefully pinning the blame on Galt.
On the lam from the cops, Galt must rely on Kathleen to help gather enough evidence to prove his innocence.
Special Notes: This film was based on the serial story "The Dark Corner" by Leo Rosten, which was published in Good Housekeeping (Jul-Aug 1945). Fox paid $40,000 for the rights to Leo Rosten's story prior to its publication in Good Housekeeping. Rosten published the story under the pseudonym Leonard Q. Ross, a name that he reserved for his fictional and humorous writings.