Grey Lensman (The Lensman Series, #4)

The action in Gray Lensman picks up immediately where Galactic Patrol left off, in the middle of the battle to destroy Helmuth's Main Base and, it is hoped, fully end the threat of Boskone. After the base falls, Kinnison finds some clues that lead him to think that Helmuth was perhaps not the head of Boskone after all. The clues lead Kinnison to mount an expedition aboard the newly constructed super-dreadnought Dauntless, into the Second…