Jolan, the son of Thorgal and Aaricia, has become a robust and curious kid of everything. The strange signs that he traces and of which he himself ignores the meaning, intrigue his parents a lot. During a getaway, he became friends with a boy of his age. The child seems lost and he dreads adults. Deaf and mute, he cannot answer the questions raised by his mysterious presence. How did Jolan, who can't read, decipher the inscriptions engraved on the bracelet which he calls Alinoë?