When a homeless little ghost knocks on the door to the eccentric residents of a Ghost Train on the lookout for a place to belong, she accidentally attracts the attention from the 'outsideworld' and must team up with the motley crew of monsters on a crazy quest to save not only the future of the Ghost Train but also her only chance to finally have a family of her own.

Housed in a shelter for young mothers, Jessica, Perla, Julie, Naïma and Ariane, all of whom have grown up in difficult circumstances, struggle to obtain a better life for themselves and their children.