You & me at the end of the world

For five days teenager Hannah Ashton has been living a nightmare because Greater Houston is devoid of people and totally silent, but then she finds Leo Sterling, a boy from her school whom Hannah considers to be both hot and trouble; together they set out to explore their city, and their own emotions--but above all they need to find out what has happened to their world, or risk being separated forever.
The entire city around Hannah Ashton is empty, except for one other person: Leo Sterling. Stuck with only each other, they explore a world with no parents, no friends, and no school. Hannah doesn't have to be just an overachieving, music-box-perfect ballerina, and Leo can be more than a slacker, 80s-glam-metal-obsessed guitarist. Together they search for answers amid crushing isolation. But while their empty world may appear harmless, it's not. Nothing is quite as it seems, and if Hannah and Leo don't figure out what's going on, they might just be torn apart forever. -- adapted from jacket