Matt Cannon always knew his best friend, the president of the United States, could be a target for assassination. In today's world of ultra-partisan politics fueled by the rhetoric of violence, there was always SOMEONE who wanted the president dead. Federal agent Alexandra Lake knew the president was a target of hate groups. In a nation of over 300 million people, there was always SOMEONE prepared to attack the president. What neither of them could guess in a thousand years was WHO that someone would be.