I Met a Murderer (1939)

Farmer Mark Warrow lives an unhappy existence with his shrewish wife Martha. His only happiness comes from his dog. When his wife loses her temper and kills his beloved pet, Warrow snaps and murders Martha. He goes on the run and comes across a young woman in a caravan. She gives him a lift and unbeknownst to him, she recognizes him and plans to write a book called "I Met a Murderer". She unexpectedly falls for him as the police close in.