Disappointed

My son LOVES this book so the app was a must when I saw it. However the app crashes every time either half way through the book or right at start up. My poor little boy gets so frustrated because he so badly wants to play with this app and cant get into it 75% of the time and when he does he cant finish it Its one thing to disappoint an adult, but how can you explain to a 1 1/2 year old that he cant play his favorite app because its broken?
PLEASE fix this app and also allow to choose a place in the book to start instead of having to start at the beginning every time.
Once fixed this will definitely be a 5 star app.

Trying to conceive about Freight Train