Strasbourg, 1518. An inexplicable trance grips the city’s inhabitants. Stricken by a strange contagion, they dance relentlessly, unable to stop, until they collapse from exhaustion. As the frenzy spreads, the afflicted seem trapped in a feverish rhythm, their bodies moving against their will. What caused this outbreak of unstoppable motion? The film investigates one of Europe’s most baffling historical enigmas.