Gia and Abby have been friends since childhood, forever bonded by the tragedy that unfolded in Greece when they were eighteen. Now thirty, heiress Gia is back in Greece with her shiny new husband, entertaining glamorous guests with champagne under the hot Mediterranean sun, while bookish Abby is working fourteen-hour days as an attorney.

When Gia invites Abby on an all-expenses-paid trip to Sweden to celebrate her birthday, Abby's thrilled to reconnect.

But on the day of her flight, Abby receives an ominous email that threatens to unearth the skeletons of her past, and when she and Gia's brother, Benny, arrive in Sweden, Gia isn't there. Worried, Abby and Benny fly to Greece, where they find Gia's beachfront estate eerily deserted, the sole clue to her whereabouts the manuscript she penned, detailing the events leading up to her disappearance.