Happy Place by Emily Henry

In Happy Place by Emily Henry, Harriet and Wyn are a recently un-engaged couple, but they haven't told anyone, including their group of close-knit college friends, about their broken engagement yet.

When their annual summer trip to Maine rolls around, the whole gang gathers at an idyllic summer beach house, and Harriet and Wynn find themselves thrust together again for the week. They're left pretending to be engaged and in love, though in reality they haven't seen each other in five months and certainly haven't discussed the finer details of their broken engagement.