I’m on the home stretch in The First Fifteen Lives of Harry August by Claire North and, after bogging down a bit in the middle, the book’s now shifted into high gear. The protagonist is trying to stop his former friend, a scientific supergenius who is now his archenemy, from… well, never mind. No spoilers.
Wool by Hugh Howey was recommended to me - a sf novel about an underground human colony centuries after some unspecified catastrophe ruined the Earth’s surface - but the writing is clumsy and the characters are cardboard-thin.