In Act Two, Nat and Grandpa talk about fixing up the old library. Nat: We get our friends to roll their sleeves up and get to work. Grandpa: It's certainly a good idea. And Robbie and Alexandra offer to help too. So they agree to meet the next day. Alexandra: And tomorrow morning we'll all meet here to discuss the plan? Grandpa: Tomorrow morning it is. But the next day ...  Nat: Where's your grandson Robbie and his friend Alexandra? Weren't they going to be here this morning? Where could they be?