Mia is thirty and getting divorced. She moves into a studio apartment in a low-income housing project. As a former swimming champion, she now finds herself giving swimming lessons to the other inhabitants... Without a pool...

Simon, a young German doctor who lives and works in Marseille, goes missing. His appartment is empty. His mother Valérie is desperate. She doesn't understand the reason of his disappearance. Therefore she asks Jens, Simon's former boyfriend, to come to Marseille and help her find him.