Baptiste Molino has devoted his life to other people's happiness. Moored on his houseboat, he helps his clients navigate the waters of contentment, yet remains careful never to make waves of his own. However, it is Baptiste's new client, the elegant and enigmatic Amandine Rousseau, who is the puzzle he longs to solve. But when his mysterious birth mother's legacy finally reveals itself, he finds himself torn between pursuing his own happiness and safeguarding that of the one he loves.