If you know nothing about Mt. Whitney, this is the book to read. Even if you are not planning to hike it, there is a plethora of information about history, terrain and what to expect.
I read this book in preparation for my Mt. Whitney hike. I had already done research before to see if I was even able to do it so a lot of the preparation information was redundant for me.
I did enjoy how there were sections for day-hikers and multi-day hikers with what to bring for each type of hike. Overall, a quick read and a very good starting point if you are just curious about Mt. Whitney.