Larry is a citizen of the Galactic Union, a Federation of advanced planets. He works as an undercover agent for the Interstellar Exploration Program, and on a routine mission he stumbles on a covert operation by Zilon, a ruthless member planet of the Union. In the process, a fellow agent is killed. He seeks to expose the operation and obtain retribution for his dead colleague, but the Ziloni frame him and he becomes a fugitive from the Union.
Larry flees to present-day Earth, where the existence of the Union is unknown. Karen is an Earthgirl seeking the man responsible for her sister's death. But one simple case of mistaken identity and a reckless decision suddenly sees her life in turmoil. She mistakes Larry for the killer, and unwittingly stows away on his spaceship.
Her future is now irrevocably linked to his. Unable to return to Earth because Ziloni ships are waiting for him, Larry's only chance is to infiltrate a Ziloni military base and obtain evidence to clear his name. Karen has no choice but to accompany Larry on his dangerous mission, and she is thrown into the strange environment of the Galactic Union.