Agatha Christie:And then there were none question>?

I am on chapter two, where Mrs.Roberts or Rodgers or whatever her name is oversleeps. i'm not there yet but I know that is what happens. I'm supposed to go to the "study"which I think is really the l ibrary cuz there is NO study on the map. Well i know that I have to look "closely @ the map on the wall and look for shipwreck island but I can't get to it! I can only go to where he sees bookends and he says"these hav not been used im awhile or something like that! And I can't get to the picture of the owners of the mansion before the owens! The closest I can get to is that "beautiful"globe that is right in the middle of the room!!Please help me, cuz I will NOT be able to get to the next morning without looking @ it.!!And it's driving me NUTS!!!!ARG!!!!!!Ok well THANKS!!!10 for best(or the 1st one who answers, it depends on the answers. Oh and I need help to get over there. Do I need a telescope? Or am I doing something wrong? Please help me!!!!TTYL!!