The ongoing war between Humanity and the Ulant is a battle of attrition that Humanity is losing. Humans do, however, have one technological advantage - trans-hyperdrive technology. Using this technology, specially designed and outfitted spaceships - humanity's climber fleet - can, under very narrow and strenuous conditions, pass through space undetected. "Passage at Arms" tells the intimate, detailed, and harrowing story of a climber crew and its captain during a critical juncture of the war.