Was Zeus a Greek God or merely a space explorer?

Following his mission to bring civilization to Earth, Zeus vanished on a newly discovered planet in the system Wolf 1061. Before he left, he set up a follow-on mission to come for him 35,000 years in the future. LifeShift tells the story of how, at a small high school in the Midwestern United States, in the Earth year 1957, that quest came to light.

That year, when sixteen-year-old Alex Monroe escaped death in an Illinois train yard, he learned that it was no accident. The same night, he dreamt he was with a beautiful girl in a strange world. The next day, he found the details of the dream not only don’t go away, but the girl in his dream is a new student at his high school. Which life, he wonders, is his?

Circe, the girl, tells him she is the reincarnation of Lachesis, one of the Moirae, or Fates, of Greek Mythology. An original offspring of Nyx and Zeus, she is an Eternal, from an advanced race of humans. He learns he may also be an Eternal, whose memories have been blocked, and he has some prescribed destiny. He discovers other girls at his high school are also Eternals, the reincarnation of various Greek figures, including Susan, who is Iris, the Goddess of the Rainbow; Irene, who is Atropos, the oldest of the Moirae; and Patty, who is Celaeno, one of the Seven Sisters of the Pleiades.

While not knowing that Alex has been picked to lead a quest to join Zeus, Circe (Lachesis) and Irene (Atropos), take him under their protection, as Eris, the goddess of Strife, and various not-so-nice Eternals attempt to rectify the mistake of his escaping death in the railroad yard. Irene is able to trace back his memories to his last life, as a German Luftwaffe pilot prior to the Second World War, and finds his future as an Eternal is tied to the recovery of the Moire's youngest sister, Clotho, the details of whose rebirth have been hidden.

Alex, in his journeys with Irene and others, eventually discovers that thousands of years ago, he was selected for the mission to join Zeus, who disappeared while exploring another planetary system eons ago. To do that, he must first find Clotho. Alex's only clue is he can find her somewhere in California's Sequoia National Park. Clotho was born at the same time he was, and he must be with her at the exact moment of their seventeenth birthdays for her to regain the knowledge of her past.

When he finds her, he discovers that his quest has only just begun.