While this book hasn't aged perfectly, it presented some surprisingly sophisticated side issues...published in 1960, it postulated a Los Angeles of the 1990s that has become overcrowded to the point of pushing out single family homes in favor of apartments [and trailer parks, oddly], which has led to the building of mass transit rail projects. Other than the trailers, Charbonneau was correct both in effects and time frame.
The gist of the story is an alien invasion story that would have made a wonderful Outer Limits episode: what if there was a form of alien invasion that accidentally mimicked paranoid schizophrenia, in terms of the clues to the invasion. Who would believe you?
Several twists occur, most of which work quite well. The book is 50 years old, and reads like it on some levels, but it reminds me of some of the better 50s sf and horror movies, and is very enjoyable on that level.