Who is Aiyanna, and what are the meanings of the magical tattoos appearing, morphing, and moving across her body? Where did the artifact come from, and why is Aiyanna here?
In 2167, a secret government agency, in the aftermath of the asteroid collision, rushes to discover time travel, risking self-annihilation.
Aiyanna and Jack are pursued by the mafia in 1980, Las Vegas; street gangs in 2014, San Diego; Homeland Security in Manhattan during the 2040's; and time travelers from 2167. They must exploit time travel benefits and avoid its perils to deal with these threats, and to uncover the roles of Fate, and Free Will in the outcome of Jupiter's Hammer.
Will Jupiter's Hammer smash into Earth? Can they stop it? Should they try? What will become of Aiyanna and Jack's growing attraction?