Emma and Henri were supposed to grow old together. They were sisters and best friends. Emma always imagined them as little old ladies living together in a huge house by the sea.

But that was before—before the boat accident, before Emma and Henri washed ashore, before they got mixed up with Alex, a boy they barely know. The island is beautiful, but there is no fresh water, no food, no shelter. All they have are each other. And their secrets.

As nights on the island turn into days, Emma hopes the need to survive, the desperation for comfort, will drive Henri back to her. Instead they’re farther apart than ever. And Emma finds herself drifting closer to Alex—Alex, who can’t u