Jonah is alive.
The night the sky fell, the door of a ruined car folded around him and kept him — and now he, Matt, and a girl named Madison are hiding in a small house on a dead street, hunting for one thing: a phone charger. Because somewhere out there, Mary is alive too, and the first phone she finds, she'll call. When a droid comes through the walls, an old costume sword earns its keep — and a long black car pulls up alongside three running kids with a gun and an offer that isn't one.
Across the city, Mary's search for Jonah becomes a van, an ambush, and a tower full of patient machines. Two groups, two chargers, one number. At the end of the day the call finally comes — and the distance between a ringing phone and a reaching hand is the cruelest thirty feet in the world.

The morning after the sky fell, Mary Solomon washes ashore alive — and something washes ashore with her, living behind her heart.
While her father's man Guthrie descends into the burning city with a satellite phone and an impossible errand, Mary learns what the deep left inside her: a wound that heals like sapphire, a voice that speaks in waves, and a shape that stands up out of her when she stops fighting. In the ruins she finds new company — Tia, Logan, and a young man named Zach with a steel case he claims is the reason he's alive — and one thin bar of signal that changes everything: the shielded city of Sangara is still standing.

Mary has a bedroom the size of most people's apartments, a phone she isn't allowed to lock, and a father who owns enough of the city that the mayor takes his calls. She also has Jonah, and Jonah is the problem.
One stolen night. A party on the wrong side of town. And then the sky catches fire, and every soul in the city runs for the Arks ( the hundred-year-old evacuation shuttles nobody ever believed would fly.)