Vincent attempts to thwart the alien infiltration of a Air Defense Command Unit.

A Russian ambassador summons David Vincent after he finds that a burglar caught inside the embassy is an alien.

David deceives the aliens that he is willing to work with them for a fee, all the while with a plan of attack in mind.

A pair of aliens who want to return to their home planet and make a political argument against the invasion of Earth ask David Vincent to help them elude an intensive police manhunt.