Nantucket Nights is a novel by Elin Hilderbrand that explores the deep and sometimes mysterious bonds between women. The story unfolds on the island of Nantucket, where three friends Kayla, Antoinette, and Val have maintained a 20-year tradition. Each summer, they set aside their daily lives to share a night of champagne, stories, and swimming under the stars. However, their ritual takes a dramatic turn when one of them swims out into the ocean and doesn’t return.