M. Night Shyamalan just announced that his new movie is titled Old, revealing the poster to his nearly 200,000 Twitter followers, but the film's plot has remained a mystery -- until now. Collider can exclusively reveal that Old is inspired by the French graphic novel Sandcastle by Pierre Oscar Levy and artist Frederik Peeters. An insider told Collider that Shyamalan received Sandcastle as a Father's Day gift and loved the premise so much that he purchased the rights to the graphic novel, which served as a launching point for his script. Sources say the events of Old are …