The rattrap seller is a homeless fellow who stays in the crofter’s cottage for a night. The crofter entertains him as a guest and friend. But the rattrap seller returns later the next day, smashes the window pane and steals the money of the crofter.
The fortune however turns later when the iron master mistaking him to be an old comrade takes him home. There he stays for two days as his guest. Once again he is on his way to continue his usual profession of selling rattraps, thievery and begging. But he sends a letter to the iron masters daughter telling her that she was a wonderful hostess and he cannot lie to her. He also returned the money that he had stolen from the crofter and asked her to return it. He lets her know that this whole world is like a rat trap. Just like the rats are trapped by cheese and food similarly men are lured by land, food, shelter, clothing etc. these are baits. Those who touch them are trapped