Nuclear physicist Mark Renfro will do anything to keep his daughter safe, including building a "suitcase nuke" for the radical group that killed his wife. Imprisoned alone in a makeshift lab, Mark has all but given up hope of seeing his daughter again. Until his captors provide an assistant—the beautiful stepdaughter of the terrorist leader. Angry and defiant, Erin Daniels has no intention of assisting anyone—including a gorgeous scientist. That is, until a time bomb is strapped around her neck. They have one week to finish…or Erin dies. Mark knows he's Erin's only hope for survival. And she's his only hope for a future.