Death’s End by Cixin Liu translated by Ken Liu.
Summary: The third and final book in The Remembrance of Earth’s Past trilogy (best known for its first book, “The Three-Body Problem”). To say that this is an epic conclusion is an understatement to what the word epic means. The story is manifold but primarily focuses on Cheng Xin, an aerospace engineer of the 21st century, and picks up after the defeat of the Trisolarans via the dark forest deterrence. The novel then swings a wide arc into the future, with some very interesting physics ideas spaced in along the way.
Rating: I’m inclined to put this one at about the same level as the first novel, I think I enjoyed the second the most (though I suspect that I like Ken Liu as a translator better. I can’t attest to how the translation compares to the original but there were less points in his translations that I knew I was reading a translation). I highly recommend the entire trilogy, especially if you like hard science fiction.
Speculation: Would give away too much! This is speculative hard sci fi at its best.