This is a long shot, but it is worth a try. I am hoping that someone will remember a children's book from the seventies. It was a paperback, the cover was Buff-coloured, and there was a picture on the front of a black and white cat tiptoe-ing across the rooftops. I'm afraid that is all the information I have, except that the book was mostly print, but with a few small line drawings throughout the book. Does this jog any memories?