Ricardo and Felipe are in charge of leading a group of family children to a summer camp in Asturias. The train they're traveling on departs before schedule while they're on the platform and leaves the unsupervised children inside. Ricardo and Felipe start an against-the-clock eventful chase trying to get onto the train before it reaches destination while the cheeky children try to avoid the train paranoid ticket collector with cunning tricks.
Ricardo is the chosen parent to take all the kids to a camp by train. On a stop, Ricardo and grandma Felipe take an outdoors smoke-break, and the train leaves, with the children but without the grown-ups, setting off a hilarious chase.