UK reviewer.
I bought "Who Is a Stranger and What Should I Do?" (from here onwards I'll call it WIASAWSID) along with "Not Everyone is Nice" 2003/2009 and "It's My Body" 1982, to help teach a 5-year old and a 7-year old with mild Autism about personal safety when they are out and about.
The illustrations in WIASAWSID were not full colour like the cover, they were lifelike multicultural pencil drawings printed in black, white and blue. There was a lot of text, and the author addressed the child directly. In my opinion it was more useful as an independent reading book for the 7 year old (who is a very good reader) than for the 5 year old (Not Everyone is Nice is simpler, and in my opinion better at this stage, for the 5 year old). However, the 5 year old was interested enough to listen to an adult reading it.
The text is very good, and the only disadvantage of WIASAWSID from our point of view was the American vocabulary e.g "crossing guard" instead of "lollipop man/woman", "garbage man", "grocery-store clerk", "public bathroom" instead of toilet, "gas station" etc. At. the end, there is a review of safety rules and a list of questions to ask parents and teachers, a "what if?" quiz with answers, and on the last page are guidance notes for parents.
Once we got around the vocabulary, we found this book really useful, and well worth the money. It seems very cheap compared to other, less useful, books I have bought.