Mrs. Géquil is an eccentric teacher despised by her colleagues and students. On a stormy night, she is struck by lightning and faints. When she wakes up, she feels different. Will she now be able to keep the powerful and dangerous Mrs. Hyde contained?

Madeline Jekyll meets Baron Stana, a distinguished looking man, and finds her father has promised her in marriage to Daggerts, a politician, who, in reward, has agreed to see that Jekyll is elected governor. Madeline is already in love with Robert Mayhew, and rebels at the prearranged marriage.