For the past two decades, Rocky has looked forward to her family’s yearly escape to Cape Cod. Their humble beach-town rental has been the site of sweet memories, sunny days, great meals, and messes of all kinds: emotional, marital, and—thanks to the cottage’s ancient plumbing—septic too.

This year’s vacation, with Rocky sandwiched between her half-grown kids and fully aging parents, promises to be just as delightful as summers past—except, perhaps, for Rocky’s hormonal bouts of rage and melancholy. (Hello, menopause!) Her body is changing—her life is, too. And then a chain of events sends Rocky into the past, reliving both the tenderness and sorrow of a handful of long-ago summers.

It’s one precious week: everything is in balance; everything is in flux. And when Rocky comes face to face with her family’s history and future, she is forced to accept that she can no longer hide her secrets from the people she loves.