The Independent Command (Star Trek: Flight Engineer, Book 3)

"Star Trek's" "Scotty" and Stirling continue the saga of Peter Raeder, former fighter pilot and unorthodox war hero, and his ship, "Invincible." On a desperate mission to hit the alien Fibians behind the lines, the battle drives Raeder deep into alien space and damages his ship beyond hope of returning home. There, he discovers the monstrous Fibians may not be monsters after all.