When it comes to books on dementia there is certainly no shortage of great content that covers the subject from most angles. from: understanding mild cognitive impairment (MCI), living with dementia, dementia health and fitness, the science of dementia and for various carers books.
This is by no means an exhaustive list, it's more a starting point. I recommend downloading a sample of some of these books which most good ebook sites allow. This way up can determine if it's what you're looking for prior to purchasing.
The Memory Bible, An Innovative Strategy for Keeping Your Brain Young by Gary Small
Mind Your Brain, The Essential Australian Guide to Dementia by Kailas Roberts
What I Wish People Knew About Dementia, The Sunday Times Bestseller by Wendy Mitchell
Remember, The Science of Memory and the Art of Forgetting by Lisa Genova
Please let me know if you've read any other great books on dementia. I'll be happy to update the list.