Earth is under attack again! The Eddorians have developed their own version of The Lens, and with hyperspace tubes are potting an invasion of their own Black Lensmen. Kimball Kinnison and Clarissa McDougall’s five offspring are known as The Children of the Lens are called upon to use their enhanced Lensman powers to try and thwart Eddore. The final book in the Lensman series. – Summary by The Narrator