Hector's life seems perfect, but it's not. Hector is a successful, well-meaning and eccentric professional, filled with childlike wonder, but he's stuck. He's a busy psychiatrist with a thriving practice, living with his beautiful girlfriend, Clara, in a fabulous London flat; but he's losing patience with his patients, who aren't getting any happier, and his romantic relationship isn't going anywhere. Hector feels like a fraud. How can he help his patients be happier when he doesn't really know what happiness is? And so, Hector sets off on a global quest in search of happiness.