In Crisis Era Year 8, Frederick Tyler lives quietly while his approved space-fighter plan advances slowly and public myths about the Wallfacers grow. His calm ends when a frail visitor identifies himself as Tyler’s Wallbreaker and correctly reconstructs Tyler’s hidden strategy: Tyler never expected conventional victory, so he meant to let ETO-controlled suicide fighters first betray and cripple Earth’s fleet, then approach the Trisolaran fleet under the pretense of delivering water mined from icy bodies such as Europa, Ceres, and comets, and finally seize back control of the fighters and detonate their bombs at point-blank range. Tyler admits the analysis is correct, but the Wallbreaker adds the most crushing point of all: Trisolaris does not even care about the plan.

Tyler visits Luo Ji’s remote lakeside home and finds Luo Ji absorbed in family happiness with Zhuang Yan and their daughter Xia Xia. Tyler recounts how the Wallbreaker’s exposure became public, how the PDC declared that any plan threatening humans must be stopped, and how Tyler’s own confession was dismissed as possible Wallfacer deception. Unable to escape the self-sealing logic of the Wallfacer system, Tyler breaks down, goes alone to the lake, and kills himself. Soon afterward, at a PDC hearing, Hines and Rey Diaz present plans that remain blocked by current computing limits, so both decide to enter hibernation, while Tyler’s death intensifies criticism of the Wallfacer Project. In parallel, Zhang Beihai keeps planning for the far future of the Space Force, argues that political cadres may need to be sent forward by hibernation, and makes his first trip into orbit, where stalled technology and institutional inertia reinforce his long-term concerns.

Luo Ji’s own retreat collapses when he wakes to find Zhuang Yan and Xia Xia gone, with a note saying they are waiting for him at doomsday. Secretary General Say arrives and explains that the PDC removed them to force Luo Ji to act, though they have merely been placed into hibernation. Say also reveals that Trisolaris had ordered Luo Ji’s assassination long before, making him the one human they especially feared, and urges him to become his own Wallbreaker and discover why. This shatters Luo Ji’s passivity. He concludes that Ye Wenjie’s conversation at Yang Dong’s grave is the key, especially her axioms about civilization’s need to survive, its endless expansion, chains of suspicion, and technological explosion.

As winter deepens, Luo Ji obsessively rethinks Ye Wenjie’s ideas while wandering the frozen landscape alone. He gradually realizes that the answer lies not in complex sociology but in simple universal rules, and while trying to enter a state of pure thought beneath the stars, he steps onto the frozen lake. Luo Ji momentarily glimpses the terrifying truth of cosmic civilization, then falls through the ice. During the struggle to save himself, the insight becomes complete enough that he emerges changed, terrified of the stars, and declares to himself, “Wallfacer Luo Ji, I am your Wallbreaker.”

Afterward, Luo Ji demands an extremely secure underground base in China and begins acting decisively. He consults astronomer Albert Ringier to confirm that ordinary Earth-Trisolaris communication does not reveal Earth’s exact position to distant observers, but that a civilization with an immense galactic database could identify a star if sent a unique three-dimensional pattern of surrounding stars. Luo Ji then requests an early Wallfacer hearing and, attending remotely from his bunker, presents a nearly resource-free plan: use the sun as an amplifier to broadcast the coordinates of the distant star 187J3X1 into the universe. Luo Ji calls this broadcast a spell, claims its eventual effect on the target system will be catastrophic, says it is only a proof of concept for a future use against Trisolaris, and announces that he will hibernate until the result can be observed.

The ETO receives a new Trisolaran order to kill Luo Ji, but the bunker’s physical defenses make direct attack impossible. Instead, an engineered virus spreads as a genetic weapon: it causes only mild “bed flu” in most people, but becomes lethal when it recognizes Luo Ji’s genes. Luo Ji’s condition rapidly collapses into organ failure, and arriving experts conclude that modern medicine cannot save him; only immediate hibernation might preserve him. Two days later, Earth sends Luo Ji’s high-power radio transmission toward the sun, which magnifies and reflects the message outward at light speed, and Luo Ji enters hibernation as his “spell” begins its journey through the cosmos.