Classic nuts-and-bolts Science Fiction with heart.

With Sam hunched over the steering wheel, and Hannah gasping about his driving, the air-car whizzed through a maze of giant tunnels on a mission of mercy. Hours too late... The car dodged whole families drifting and screaming in zero gravity. The air was littered with flotsam: leg-tied chickens, blankets, cord wood, buckets slowly trailing water, rocks tied for anchors and lost, a squealing pig, a treetop. Hannah watched a wailing child spin past, then a swooping bird-m...