About the title
By the age of forty, Alain and Marie have finally achieved financial stability and are able to buy the house of their dreams in the suburbs. During a viewing, the real estate agent warns the couple that the house holds a secret: a hatch leading to an underground passage. This hatch holds a secret capable of completely changing their lives. After visiting the hidden passage, Marie becomes obsessed with the secret revealed to her, while Alain remains indifferent to the house's "special feature." But Marie isn't the only one developing strange quirks — Alain's boss is also eager to share an incredible discovery with him.