As it is now LGBT Pride Month it seemed like this would be a good book to read. In light of the hysteria over transgender people using what bathrooms the title and book seemed quite apt for giving people much needed information.
The book is basically what it says on the tin: the authors look at 21 myths about transgender people. Some are probably familiar to the reader: that transgender people use the "wrong" bathroom if they don't "look" a certain way, that transgender people are mentally ill and the like. And there might be some that are not so obvious: I had never heard of the concept that all transgender people all secretly want to be Barbie or Ken.
So it was a learning experience. Backed by anecdotes, statistical data, research, and historical examples the authors go through and dismantle various myths. Overall the book was informative, even when I was already familiar with the myth. It's also relatively short so if you're looking for a primer for someone (a parent or a friend who wants more information) I think this might be a good pick.
There are also resources of sites, groups, organizations, legal resources, etc. that you may find helpful.
The only problem I had with the book was that the writing was quite dry and academic. My interest in the subject matter kept me going but I could really only read a few chapters at a time (and the chapters are really not that long at all from a few pages to maybe 7-8). The book runs less than 200 pages including the index, resources, citations, etc. but I personally found the text a little excruciating at times.
But that should not be a detriment. As I wrote it's a relatively short book so it shouldn't be too intimidating for a reader who is looking for more information. If you're more familiar with the subject and/or the specific myths addressed by the authors you may feel it's redundant to your own information so those with better/more in-depth knowledge may want to skim this first before deciding if you really want/need the book. But I definitely recommend reading it.