If you are thinking there’s going to be aliens in this book, well, there aren’t. We only see the alien perspective in the last 60 pages.
If you are thinking the “Three Body Problem” pertains to gender or sex. You’d be wrong. This book is about as sexist as you can get. Women constantly being murdered. You constantly see the text saying “She shouldn’t be in this field” all the time.
What is the “Three Body Problem”? A math equation about three ‘bodies’ in orbit around each other.
The only one living is Ye Wenjie and she’s not on the good side. Everything is male and default male. Even the Trisolarians.
The rest of the book? It’s a pure slog fest...