Unanswered questions. A sailing adventure gone wrong. The Sheridan sisters face the end of the season that changed their lives forever.

Lola Sheridan is the youngest Sheridan sister: a whip-smart journalist with a flair for the dramatic. As her older sisters settle into new lives on the Vineyard, Lola demands more out of the summer season with a fantastical sailing expedition up from the Florida Keys to Martha’s Vineyard. The sailor who takes her? The mysterious, dark-eyed loner, Tommy Gasbarro—the ex-stepson of the Sheridan sisters’ greatest enemy. He represents so much of what went wrong in Lola’s life—and knows secrets about her mother that she was never allowed to learn.

Susan continues on with her chemotherapy, and her illness remains on the forefront of the sisters’ minds. Wes Sheridan grapples with his dementia, as Christine continues to find new ways to push beyond her traditional gloomy behavior. All the while, Lola’s only daughter, the nineteen-year-old Audrey, inches through her pregnancy, and comprehends the depths of her mistake and what second-chances are really all about.

August on Martha’s Vineyard is a last grasp at the beauty of summer. As the tourist season comes to a close, the Sheridan sisters find opportunity for rest, for renewal, for strength, and for acceptance. Surrounded by crystal blue waters and white sandy beaches, they turn inward—toward one another and the memories they’ve kept within them for many years—to find peace, to be better lovers, to accept what came before, and build something new for the future. If this season has taught them anything, it’s that together, anything is possible.