The book opens with Sam Capra, a brilliant CIA agent on assignment in the UK, taking a quick round of fierce exercise in the discipline of parkour -- a kind of rapid running with leaps, climbs, and major obstacles along the way. Home from the workout, for breakfast with his heavily pregnant wife Lucy, Sam has no realization that this will be his last moment of serenity. His life is about to literally explode. And as the lone survivor of a bombing that takes out his workplace and colleagues, Sam is suspect number one. Somebody has deliberately betrayed the group. If it wasn't Sam, it must have been Lucy -- who is either already dead, or kidnapped, and the time for that baby's birth is racing toward everyone.