The Catastrophe Theory — Tony Bertauski

Jared and Cassie have secrets.

Those secrets are tested when the world is plunged into darkness. The green flash that lit up the sky short-circuits all technology -- cars, computers, pacemakers. Everything.
They wait for help to come, but their daughter's fever continues to rise. As chaos takes over, they go in different directions to find help, neither one knowing where the other is really going. Or why.

They'll discover just how much they mean to each other. More importantly, they'll learn just how valuable their daughter is to the world.