"To Sail beyond the Sunset" by Robert A. Heinlein

"To Sail beyond the Sunset" by Robert A. Heinlein
 https://www.amazon.com/Sail-beyond-Sunset-Author-published/dp/B00GX3I1YU/
Book number eight in a very loose series of eight science fiction books.   There are also many short stories and novellas that are a part of the universe.  I reread the well printed and well bound MMPB published by Ace in 1988 that I bought new in 1990 (I think !).  I plan to reread "The Rolling Stones" and "The Moon Is A Harsh Mistress" soon.  I have going to pass on rereading "The Number Of The Beast".
This book starts with Maureen Johnson Long, the mother of Lazarus Long, waking up in hotel with a dead man in bed with her.  And the cat who walks through walls, Pixel.  She is subsequently arrested for murder and finds out that she has been kidnapped and purposefully put into this situation in a quite nasty time line where the First Prophet was never deposed in the year 2100 like Lazarus Long's original time line.
If you are offended by sex, and I mean lots of sex, in a book then I would advise you to stay away from this book and series.  Except for the first book in the series, "Methusalah's Children".  All of the books, except the first book, have group marriages in or mentioned in them which was first expounded by Heinlein in "The Moon Is A Harsh Mistress" book.
The book is also an in depth examination on how society in the USA changed from 1880 to 1980.  Technology changed radically in that time and so did societal morals about sex and drugs, not for the better.
The rather loose book series is (there may be more):
1. The Moon Is A Harsh Mistress
2. The Rolling Stones
3. Methuselah's Children
4. Time Enough For Love
5. The Number Of The Beast
6. The Pursuit Of The Pankera
7. The Cat Who Walks Through Walls
8. To Sail Beyond The Sunset
There is a rather excellent timeline of Heinlein's books at:
    https://www.sffchronicles.com/threads/579486/
Jo Walton, the Heinlein apologist, says that "To Sail beyond the Sunset" is Heinlein's worst novel.  I disagree.
    https://reactormag.com/heinleins-worst-novel/
My rating:  5 out of 5 stars
Amazon rating:  4.7 of out 5 stars (263 reviews)
Lynn