The rest just seem to contain pictures that follow the theme given in the title but don't relate to each other. Ten minutes later, *I* was hooked! So now I have several for my 3-year-old niece and several that I'm 'holding' for her.'Treasure Hunt' is my favorite 'I Spy' because the pictures relate to each other and when followed tell a story. I thought it was strictly a children's book, and I only bothered looking at it to make sure it contained nothing objectionable.
I didn't pay much attention to the 'I Spy' books until I bought one for my niece.