Suffering from scoliosis as a teenager, Audrey Mestre found freedom in the ocean. Years later, she discovered another reason to love the water: the elusive, often raucous free diver Pipin Ferreras. As Mestre follows Ferreras's almost spiritual quest to push his limits underwater, she moves from supporter to ardent free diver to world-class competitor. Then a challenge from a rival pushes the couple to the brink of what is possible, both above and below the surface.