King Of The Underworld (1939) | FILM NOIR/CRIME | FULL MOVIE

Niles Nelson is a gifted young doctor but makes a mistake when he treats a wounded member of mobster Joe Gurney's mob. When Nelson regrets his actions and tries to withdraw from the arrangement with Gurney, he's killed. Worried about his image, the egotistical Gurney kidnaps a penniless writer Bill Stephens to write his version of his memoirs. Nelson's widow, also a doctor, realizes that Gurney will kill Stephens after the 'autobiography' is finished, and she decides to take action that will save them both.

IMDb: https://www.imdb.com/title/tt0031536