Bestselling author Stephanie Perkins has written her best book yet, a debut adult novel about new beginnings and finding your way into adulthood.

Ingrid Dahl is a cheerful, twenty-nine-year-old librarian living in the cozy mountain town of Ridgetop, North Carolina. She and her boyfriend since college, Cory, have never discussed marriage; they're perfectly happy with the way things are. But when Ingrid's sister announces her engagement to a woman she's only been dating for two years, Ingrid and Cory suddenly feel pressured to start thinking about the inevitable: marriage and kids.

The thing is, neither of them has ever been with anyone else. Shouldn't they sow their oats before settling down? So they make the unusual decision to separate for a month to date other people, assuming that at the end of it, they'll reunite and start planning their nuptials. And Ingrid has the perfect man in mind for this relationship sabbatical--Macon Nowakowski, her cantankerous and completely adorable coworker for whom she's had a crush for years. But of course the best laid plans often go awry, and when Ingrid and Cory meet at the end of the month to resume next steps in their relationship, it's clear neither of them is ready to get back together, and Ingrid's plans for an innocent hook-up with her co-worker have turned into something much, much more.