Finally, vacation! Nine-year-old Lucie travels alone to the countryside to visit her mother Caro, who is leading an exciting excavation in her home village. But among the hills, forests, and a real castle ruin, Lucie discovers more than just fresh country air: an old family secret awaits her! Together with her new friend Yann, the cheeky goose Zerbinette, and two chatty blue tits, she plunges headlong into an exciting adventure. From the dark castle cellar to an abandoned caravan at the edge of the forest, her treasure hunt is full of puzzles and surprises.

The Treasure Hunt in Blue Tit Valley is Antoine Lancieux's feature film debut and is based on very personal, autobiographical experiences—an impressive animated film with great attention to detail.