Alex, an 18-year-old astrophysics student, dreams of the cosmos and of working at NASA, far from earthly concerns. But his bubble bursts when his mother, suffering from breast cancer, is about to undergo surgery: an event that diverts him from his orbit, the time of a sleepless night where nothing happens as planned, and where Alex gets lost before deciding to land...

Gellert Grindelwald has escaped imprisonment and has begun gathering followers to his cause—elevating wizards above all non-magical beings. The only one capable of putting a stop to him is the wizard he once called his closest friend, Albus Dumbledore. However, Dumbledore will need to seek help from the wizard who had thwarted Grindelwald once before, his former student Newt Scamander, who agrees to help, unaware of the dangers that lie ahead. Lines are drawn as love and loyalty are tested, even among the truest friends and family, in an increasingly divided wizarding world.

Tomorrow they'll be in Africa, where their father wished to move back ; so today, Mathis and Antoine go to Paris. A day to say goodbye, roam the town, understand homecoming and mainly learn to discover each other...