Big Brown Eyes (1936)
Big Brown Eyes is a 1936 crime/detective film. In the film, police officer Danny Barr (Cary Grant) is chasing jewel robbers. His girlfriend Eve Fallon (Joan Bennett) is initially working as a manicurist, but quickly takes a job as a reporter assisting in the effort against the jewel thieves. Fallon and Barr become disgusted when one jewel gang member is acquitted, and both leave their jobs. Soon thereafter, Fallon gets a lucky break while giving a manicure and the case is solved.
More at Wikipedia.