A school excursion to Strasbourg Cathedral turns into a tragedy when a teacher is murdered in the cathedral square and nine children disappear.

The young Kiara lives with her mother Ariane. They both share a secret which has been buried for years. When Nathan, the son of Ariane's partner moves in, the secret comes to the surface.

A school excursion to Strasbourg Cathedral turns into a tragedy when a teacher is murdered in the cathedral square and nine children disappear.