Ninjutsu - the Art of Invisibility
I ran a feudal Japan newsletter for ten years, and in that time I read many books on ninja. This book is one of the more basic on the topic, covering the general history of the ninja and the rumors about their feats. It does not go into any real detail about what the ninja did, how they did it, or provide documentation for further research into specifics.

Ninja were trained from childhood to have exceptional balance, jumping ability, stamina for long runs, and great body strength. They practiced close listening, to judge how many people were in a room by minute rustles and the sound of exhales. The book goes on to explain a variety of techniques ninja would use to overcome various obstacles they might encounter.
I am less sure about the "ninja costume" laid out. I cannot imagine that all ninja clans collaborated to buy standard ninja costumes from the Ninja Costume Store. I imagine that for a given case the ninja would research the local dress and find something to blend in but that also had secret pockets for his tools and a color to blend in with whatever he was most likely to be near. Yes, it might be a dark outfit for night work - but it could easily be light grey if the task was to go along grey walls. It might be something resembling a monk's robe if for example the ninja was going into a monastery, so that from afar he would be taken for a random monk.
That is how it goes with the book. Some sections seem quite rational and reasonable - but others seem a bit iffy. Since nothing is ever quoted with a source, and there is no bibliography in the back to see where this information came from - you're left with the impression that these are all stories handed down from current martial arts contacts of the author. I have no doubt that these sources really believe the stories they have shared! And I imagine that a portion of them are true. However, a portion is going to be legend or tales mis-remembered or mis-said over the years.
If anything, this means we are reading a list of "What current members of ninja-style fighting groups believe about their traditions" which is interesting. However, for more factual, historical information, I'd go with one of the many other books on this topic.
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