Pep (13) is completely in love with a girl from the group in his grandfather's village, Sara Amat (14). On a summer night, Sara disappears, leaving no trace. After a while, Pep finds her hidden in his own bedroom. She explains that she has run, he agrees to protect her and becomes her accomplice during the last days of summer, before they both leave the village. The boy is obliged to live a double life: he must lie to everyone while he tries to satisfy Sara's demands that test him repeatedly and make him grow up in a heartbeat just before the end of the summer.