Everything about Marcel is adorable: the tone of his voice, his shoes, his hopefulness. The tiny shell lives with his grandmother in a bright and comfortable apartment, yet his heart cannot rest: under mysterious circumstances, the two lost contact with the rest of their family. Their course is about to change. A filmmaker passing through the Airbnb where Marcel and his grandmother live posts a short film about the endearing shell online, and it quickly goes viral. The odyssey begins.