Mangini, who owned a diamond ring valued at $5,400, took the ring to Hansen's, Inc. to sell it for him. Hansen placed the ring in the window display of her store. There was no guard or grating across the opening of the window inside her store. There was a partitioned door that was left unlocked. On two former occasions Hansen's store had been robbed. Several weeks after Mangini left his ring at the store, armed men robbed the store and took several rings from the store window, including Mangini's ring. Mangini sued Hansen, who defended on the ground that she was not liable for the actions of the robbers. Decide.