Everything that little Västanvik has in terms of adventure can be found at Lusknäckarmalmen, the town's ancient marketplace. Rasmus and Pontus come here on a Wednesday evening to see the world-famous sword swallower Alfredo. By accident, they hear about plans for a silver heist to take place in the small town where they live. When Toker, who has been allowed to stay at home, gets tired of it and comes scuttling on his short little legs right into the center of the action, the adventure begins in earnest.