Fighting Back Against the Trisolarans? Not a Chance

Just as described in The Three-Body Problem, humanity really did discover signs of civilization at Alpha Centauri. At the same time, humanity's Mars program began to take shape. Our protagonist, Zhang Zizhi, was down in a mine digging for coal. Somehow, these seemingly unrelated events eventually converged. In the end, a secret about humanity itself was finally revealed. But by then, humanity no longer existed.