The rattrap peddler takes shelter in an old man's cottage and steals 30 kronor from him. Lost in the woods, he realizes he has been trapped like the rats in his traps. Exhausted, he hears the sounds of a nearby iron mill and stumbles upon the forge. The ironmaster recognizes him as an old soldier, though they have never met. Seeing a chance, the peddler pretends to know the ironmaster.