Check out what Amazon has to say about it here.
Not only is it a great search book, but it also talks about the artists and has a short biography of the painters in the back of the book. The author calls it a "spot the difference game, ghost story, and an art book...all in one!"
I couldn't just buy one, so I bought one for you too (cat not included)! If you could use this in your classroom, or you're in school to be a teacher, or you have kids or your brother's girlfriend's neighbors have kids please enter!! Crossing my fingers and toes that you win! XO, LKC