Nate, a grieving widower, is determined to honour his late wife and find a way to have the child they were desperate to raise together. After various attempts to identify a suitable surrogate come to nothing, Nate is compelled to try something radical.He travels to London to take part in a groundbreaking medical trial. As things progress, he becomes caught in the complex hinge of three powerful desires: his loyalty to his late wife, a primal urge to be a father, and his knee-weakening attraction to Sadie, who has her own reasons to resist starting a family.