Book Log 2019 #3: The Dark Forest by Cixin Liu
The second book in the Three Body Problem trilogy, the Trisolarans are on their way to Earth, and have used a form of subatomic computers to spy on Earth and prevent scientific or technological breakthroughs that might help Earth defend itself. The book focuses on how the UN tries to get around this, eventually jumping ahead 200 years to show the first contact between the two civilizations and its aftermath.
I really do like this trilogy, and would suggest taking your time reading the books. As with the first book, I feel like I read this one too quickly, and missed things. So take your time and enjoy this.