The Crime of Doctor Hallet

The Crime of Doctor Hallet is a 1938 American drama film, directed by S. Sylvan Simon and starring Ralph Bellamy, Josephine Hutchinson, William Gargan, Barbara Read, John 'Dusty' King, and Charles Stevens. The film was released by Universal Pictures on March 11, 1938.
Plot.
Doctor Hallet is working in the jungle with his wife to find the cure to the red fever, when another doctor comes to be a guinea pig for them, since he doesn't believe in Doctor Hallet's work, the men ends up dying and Doctor Hallet takes his identity and tries to finish the dead man's job.