Michel, a retired math teacher, has lived alone since his wife’s death and occupies his time writing an essay about the beliefs that shape daily life. One day he comes across Dora, a young homeless woman, who shows up injured on his doorstep, and puts her up until she recovers. Her presence brings something new to Michel’s life, but gradually the apartment becomes the site of mysterious happenings.

A scientist from the East happens in France where it is supposed to improve one of his inventions. But it is much more interested in the fact to enjoy it and have fun ...