Louisa and Gilles love each other. There's a problem in paradise, though: their marriage is going nowhere. Together, they decide to explore polyamory, the idea that it's possible to have more than one lover--and more than one love. They fall in love with another couple and, embarking on a life-changing course, try to make it work as a quad. Their journey liberates them from the constraints of their unhappy marriage and propels them into a world where they embrace a new way of loving. But this liberation comes with a price. They are challenged in ways they didn't expect, and the experiment takes them to a place they didn't anticipate. They must learn to accept a new understanding of relationships, each other and themselves.