In 1929, a Danish physician identifies a new strain of smallpox that is capable of infecting and killing even those individuals who have previously been vaccinated against the disease. Before this incurable plague reaches them, the citizens of Vaden, a prosperous town renowned for their fanatical love of children, unanimously agree to barricade the city from the rest of the world.
Only once during this time when Vaden has quarantined all of Denmark does the town make an exception. A traveling European circus is allowed into the city because the mayor cannot bring himself to refuse its sick children. Unbeknownst to the villagers, a dwarf clown who is the featured performer of the circus has just died from the virulent strain of smallpox, but not before introducing it to Vaden. A 12 year old member of the circus successfully impersonates the dead clown. One night, the imposter with his wooden flute leads the children out of Vaden through a gate in the wall.
