They have been coming to their grandmother Gloria's lake cottage since they were babies. Now Johnnie and Buddy have families of their own and C.C. has a life full of adult drama and adventure. And this trip – the only stated purpose of which is to bring the family together for the last weekend of the summer – seems full of portent. Gloria has been hinting that there's more on the agenda than grilling and swimming, and when the three siblings learn that their estranged father will also be in attendance, it becomes clear that this weekend will have implications that last far beyond the final days of the season.