Endless Summer by Elin Hilderbrand

Three years after Mallory Blessing's death (in 28 Summers), her friends gather for another eventful Labor Day celebration on Nantucket in "The Sixth Wedding."

The marriage at the heart of Beautiful Day enters uncertain territory when Margot Carmichael encourages her husband to reunite with his ex-girlfriend in "The Surfing Lesson."

In "The Tailgate" the weekend of a Harvard/Yale football game recharts the course of "Matchmaker" Dabney Kimball's first—and abiding—true love.

In "Summer of '79," the three Levin sisters reunite after a decade after the summer that changed everything.

And more . . .