A frozen Minnesota lake requires a saw to break through the ice, and “Barb” (played by Emma Thompson) travels there in her portable heated shelter for a fishing trip. Her quiet time is interrupted when a young woman arrives, seemingly against her will, being taken to a house nearby. Barb’s investigation reveals that this girl has been abducted, and that the kidnapper (Marc Manchaca) and his wife (Judy Greer), who are…