On a hike during a white-hot summer break on the Greek island of Hydra, Naomi and Samantha make a startling discovery: a man named Faoud, sleeping heavily, exposed to the elements, but still alive. Naomi, the daughter of a wealthy British art collector who has owned a villa in the exclusive hills for decades, convinces Sam, a younger American girl on vacation with her family, to help this stranger. As the two women learn more about the man, a migrant from Syria and a casualty of the crisis raging across the Aegean Sea, their own burgeoning friendship intensifies. But when their seemingly simple plan to help Faoud unravels all must face the horrific consequences they have set in motion.