There are no musical numbers (save Richard Thompson's very good but sadly misused soundtrack), and it doesn't take place in Iowa. But the story of a charming conman who sells a small town a bill of goods and then feels badly about it rings very familiar, complete with blundering yokels, unwanted echoes of the conman's past, and even a cute Opie-esque little boy. The movie does not, however, contain significant amounts of charm, inventiveness, or character. Don't bother.
Review of Sweet Talker
