For five years, Willow and Charlie were voted ‘Most Disgustingly Happy Couple’ by their friends. Until the morning Willow woke to find a note on her pillow: Charlie had gone. It was him not her, he said. Willow mustn’t blame herself. But, of course, she does.

A year on, and Willow keeps her dark moods at bay by wild swimming in her local river, dodging aggressive swans and speeding rowers. But just as she’s starting to feel like she’s over Charlie, he accidentally hooks her mid-swim with a fishing line, and all Willow’s old feelings resurface.

But why won’t Charlie tell her why he left and where he’s been? What’s his secret? Willow always felt like she and Charlie were soul mates, but after the way he deserted her, can Willow ever trust him again?