1985. To 12-year-old Mercedes, La Kastellana is home, an island with deep-rooted traditions untouched by the modern world. But this secluded paradise is upended with the arrival of multimillionaire Matthew Meade and his pampered young daughter, Tatiana. The price that Mercedes and the rest of the islanders will pay is more than they ever could have imagined. 2016. Robin has been desperately searching for her missing 17-year-old daughter, Gemma. Finding herself on La Kastellana, Robin quickly realizes she’s out of her depth. No one is willing to help, and she fears she’s running out of time to find her child. But someone has been watching, silently waiting for the moment to expose the dark truth of what really happens on the island of lost girls.

Twelve years ago, Mila Jackson’s three-year-old half-sister, Coco, disappeared during their father’s 50th birthday party. Her identical twin, Ruby, was left behind as the only witness. The girls’ father, Sean, was wealthy and influential, as were the friends gathered at their seaside vacation home for the weekend’s debauchery. The case ignited a media frenzy and forever changed the lives of everyone involved. Now, Sean Jackson is dead, and the people who were present that terrible night must gather once more for a funeral that will reveal that the secrets of the past can never stay hidden.