THE NEW YORK TIMES BESTSELLERSOON TO BE A MAJOR FILM PRODUCED BY JULIA ROBERTSNothing is as permanent as it appears...Denver, 1962Kitty Miller has come to terms with her unconventional single life. She loves the bookshop she runs with her best friend, Frieda, and enjoys complete control over her day-to-day existence.Then the dreams begin.Denver, 1963Katharyn Andersson is married to Lars, the love of her life. They have beautiful children, an elegant home, and good friends. It's everything Kitty Miller once believed she wanted - but it only exists when she sleeps. Convinced that these dreams are simply due to her overactive imagination, Kitty enjoys her nighttime forays into this alternate world.But with each visit, the more irresistibly real Katharyn's life becomes.Can she choose which life she wants? If so, what is the cost of staying Kitty, or becoming Katharyn?A hauntingly powerful novel that freshly considers the timeless question - 'What if?'