Jerry Shaw and Rachel Holloman are two strangers whose lives are suddenly thrown into turmoil by a mysterious woman they have never met. Threatening their lives and family, the unseen caller uses everyday technology to control their actions and push them into increasing danger. As events escalate, Jerry and Rachel become the country's most-wanted fugitives and must figure out what is happening to them.

A college student, who sees a UFO, uses his exceptional math skills to investigate the sighting with his friends while the FBI follows closely behind.

While three of the fiercest warriors in human history—a Viking raider, a ninja in feudal Japan, and a WWII pilot—are killers in their own right, they are merely prey for their new opponent: the ultimate killer of killers.