Twenty years of marriage. Three children. A house on Martha's Vineyard. Then one day, without warning, he walks out. No apology. No explanation. No looking back. Instant #1 New York Times Bestseller. Expanded from a viral NYT Modern Love column. Praised by People, The Washington Post, Kirkus, and Good Morning America. 4.5 stars. 256 pages. Save over 50% — limited time.