Giselle suffers from a weak heart, and discovering that her lover Albrecht is a disguised nobleman engaged to another woman causes a fatal shock.

These vengeful apparitions mercilessly surround any man who enters their forest at night, physically exhausting their victims until they collapse.

Because the Wilis are nocturnal phantoms, they lose their fatal power at dawn, giving Albrecht just enough time to survive his grueling ordeal.

Derived from Slavic folklore, the Wilis are restless spirits of young women who died of grief before their wedding days and seek eternal revenge.