My 3 yr old DD has developed a love for a 40 year old book that used to be DH’s where there is a space rocket that she can move between pages by passing it through slots in each page. The story is tedious, but I have to read it every night! I remembered today that I used to have something similar as a child, I think it was maybe a mouse or some other animal that moved between pages as you read the story. It was on a ribbon I think and used to hide behind flaps or slot into parts of the book... Any idea what book this is? Or anything else similar so that at least I have a few options for reading and don’t have to do that rocket book every. Single. Night.