Frank is the new security guard at a prestigious art exhibition opening tonight. The gallery walls are hung with dozens of paintings, each arranged in a carefully considered sequence—each picture linked to the one before and after it by a specific visual or thematic logic. Someone has snuck in ahead of the opening and rearranged them at random. Frank has until the guests arrive to restore every sequence. The exhibition cannot open with the walls in this state. Frank's job cannot survive it either.