23 - Second Stage Lensmen by E. E. Smith

Earth faces an unprecedented threat as the Boskonian organization, once thought to be vanquished, has resurfaced with devastating negasphere technology. Their plan? To annihilate Earth and all its inhabitants. It falls to Lensman Kimball Kinnison and four newly appointed second stage Lensmen of the Galactic Patrol to confront this formidable menace and safeguard civilization from destruction. This is the fifth thrilling installment in the Lensman series, following the events of Gary Lensman. - Summary by The Narrator