There is a widespread rumor in the world about a martial arts secret book called "The Broken Nine Swordsman". Legend has it that it contains a unique skill that can "kill people invisible" and can kill the enemy in an instant without showing any scars. However, this secret book has never been seen by anyone, but it has triggered countless fights and killings.
Twenty years ago, the four major sects in the rivers and lakes joined forces to destroy the "Hanyue Tower" that owned the "September Broken Sword". Since then, the whereabouts of the secret book have been unknown. Now, this mysterious killing technique has appeared again in the world, triggering a new bloody storm.
Worth reading, I really like books like this