Lea Lyon, daughter of Rabbi Mendel, spiritual advisor of a Galician town near the Russian border, is playing by a stream when she meets Constantine, a Russian prince in peasant's garb. Objecting to the attentions paid his daughter, the rabbi insults the prince. Later, war is declared, and the Russians under Constantine occupy the town; the prince invites himself to the rabbi's home, demanding Lea, but finds her betrothed to Joshua. He threatens Joshua, who pleads with Lea to surrender to the prince, but she refuses. When Constantine threatens to burn the town and its inhabitants, Lea yields to the entreaties of the crowd. Impressed by her character, the prince discovers he loves her and spares the town and the girl; she hides him from the Austrian guard, and sent from her home, she is stoned by her people; the rabbi is killed, but the prince escapes. After the war, he returns to Lea.