Following the house move of their grandfather, two boys stumble on an old manuscript, written in an unknown language.

Frédéric Ambrosini
as Professeur Jonas

Jean-Pierre Audouy
as Papy Jo

Stéfany Garrigues
as Claudine

Claude Hortala
as Marcel

Jonathan Amador
as Philippe

Julian Bertrand
as Hugo

Cloé Vidal
as Sophie

Fanny Garrigues
as Sonia

Esteban Garrigues
as Paul

Quentin Vidal
as Léo