For Lewis and Wren, their first year of marriage is also their last.

A few weeks after their wedding, Lewis receives a rare diagnosis. He's turning into a great white shark, and has less than a year left to live as a human. At first, Wren resists her husband's fate. Is there a way for them to be together after Lewis fully transforms?

But as Lewis changes, day by day, Wren begins to make peace with the inevitable. After all, this isn't the first time she's lost a loved one.

An extraordinary novel of love, loss, hope and happiness, Shark Heart explores the shapes that love takes, in all its many forms, and asks us to ask ourselves: what makes us human?