One stormy night, an unpopular physics teacher is struck by lightning and faints. When she wakes up, she begins to feel new powers within her...
Mrs. Géquil is an eccentric teacher who is despised by her colleagues and students. Submissively, she lives her life until the moment of transformation. But the reference in the title to Robert Louis Stevenson's classic sets the further direction.
Of course, Isabelle Huppert in the leading role visibly enjoys playing out her entire repertoire from the bullied teacher Géquil (pronounced Jekyll) to her overconfident Hyde version.
The film, which won an award in Locarno, moves effortlessly between French social drama, upbeat comedy and fantasy in the course of its story.