Cold New Climate by Isobel Wohl

At thirty-seven, Lydia has been with the middle-aged Tom for over a decade, and she is bored. Yet when he leaves her, she is surprisingly devastated, and makes contact with Tom's nineteen-year-old son, Caleb, fresh out of his third stint of rehab. Spare, lyrical & shot through with an unflinching wit, this book announces a major new talent.
Binding: Paperback / softback