Callie Perry is a successful family photographer living in upstate New York. She adores her two daughters, has great friends, and actually doesn't mind that her workaholic husband doesn't get home until 9:00 every night—that is, when he's not traveling six months out of the year.
Callie's younger sister, Steffi, on the other hand, has never grown up. She's a free spirit, living in downtown Manhattan and bouncing between jobs and boyfriends. Lately, she's been working as a vegan chef, even though she can't cook.
Lila Grossman is Callie's best friend and has finally met the man of her dreams. Ed has two wonderful children, but also a drama queen ex-wife who hates Lila. And then there are Callie and Steffi's parents, Walter and Honor. Divorced for thirty years, they rarely speak to each other.
The lives of these colourful characters intersect when they each receive a shocking note that summons them together for one extraordinary summer in Maine and changes their lives forever.