E. E. Smith 
Children of the Lens 

The Arisians have played a long-term strategic game to defeat the Eddorians, a malevolent race seeking domination and destruction. Now, Kinnison and Mac Dougall, along with their children, are the "Children of the Lens" and the key to the ultimate battle against the Eddorians. The lens, a device of immense power and intelligence, enhances the abilities of its wielders, allowing them to face formidable challenges and adversaries. The story unfolds as the Children of the Lens employ their newfound powers to outmaneuver the Eddorians and bring an end to their reign of terror. Throughout the novel, readers are taken on a thrilling journey through the cosmos, witnessing epic space battles, intricate strategies, and the realization of the Arisians’ plan to defeat evil and ensure the survival of a free and peaceful galaxy. "Children of the Lens" is a grand conclusion to the Lensman series, offering an action-packed, imaginative narrative that explores the ultimate struggle between good and evil on a cosmic scale, emphasizing the triumph of wisdom, courage, and unity over darkness and tyranny.