One dark night during the early phases of WWII, the Italian Royal Navy submarine Cappellini sinks an armed merchant ship sailing with lights out. At that moment, its commander Salvatore Todaro makes a decision that was destined to go down in history: to save the 26 shipwrecked Belgians who otherwise would have drowned in the middle of the Atlantic Ocean and disembark them at the nearest safe harbor. To make room for them on board his submarine, he is forced to navigate on the surface of the water for three days, visible to the enemy forces and endangering his life and that of his men.

Charlotte, a spontaneous and creative girl, is busy organizing a school dance to raise the necessary funds to save the natural oasis where she spent the best moments of her childhood. She tries in every way to show herself perfect in the eyes of the whole school, but in this way she ends up losing her sincerity, ruining her love story with Davide and above all the relationship with her best friend, Sophia. To find the things that really matter, Charlotte must first be able to find herself.