In space, a technological nightmare orbits the Earth, stalking its prey. Sheathed in a black multifaceted skin, a secret all but invisible against the darkness of space, the killer satellite hunts with one of the deadliest weapons ever created. It is Zeus - and like the god of myth it hurls lightning from the heavens.

Astronaut Kelsey Newton and her crewmates aboard the International Space Station have just settled in for a six-month mission when they discover the existence of Zeus. Alone and defenseless in orbit, the astronauts report what they know, even at the risk of becoming targets themselves. The job of finding out who placed a weapon in space falls to Kelsey's fiancé, ex-Navy SEAL Nolan Kilkenny.

Racing against time, Kilkenny must search through the wreckage of the past and find the key to disarming Zeus if he's going to save the love of his life - and opposing him is an army of mercenary killers and a megalomaniacal tycoon whose craving for power will plunge the world into chaos.