Half a Sinner is a 1940 American comedy crime film directed by Al Christie. It stars Heather Angel as a schoolteacher who in one day becomes Public Enemy Number One in Pennsylvania. The film is based on Dalton Trumbo's short story "Lady Takes a Chance". The working titles of this film were Everything Happens to Ann and The Lady Takes a Chance.

Plot

On the last day of the school year, plain 25-year-old teacher Anne Gladden has her student Willy write punishment lines on the blackboard. After the class is dismissed, she releases the boy and tells him that few can do what they want in life, so they might as well make the best of what they have. She is overheard by Margaret Ree, an older teacher. Margaret tells Anne that she regrets not doing wild things when she was young. She advises Anne to do what she never did and Anne decides to take her advice for one day.