From Indigo:

Eccentric heiress Josephine Warrick is a notorious recluse - reigning over a crumbling pink mansion on a private island, she is rarely seen but often whispered about. So when Brooke Trappnell, a struggling young lawyer, is summoned to the island, she has no idea what's in store. As she listens to Josephine recount a story of old friendship, dark secrets, and a mysterious murder, it becomes clear that Brooke is there for two reasons: to help protect Josephine's beloved island, and to make amends with her old friends, the skinny-dipping, secret-keeping girls of the The High Tide Club.
To fulfill a dying woman's last wish, Brooke must track down the descendants of Josephine's closest friends and bring them together for a reunion of women who've never actually met. But in doing so, Brooke uncovers a scandal that could make someone rich beyond their wildest dreams.or cause them to be in the crosshairs of a murderer.

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