Wake up Call

This book is about a man who is trying to escape from prison because he wants to go and visit his son but as he is in jail he gets a job to become a pilot to fight during the war and has to leave his son at home with his mum instead.

And he doesn't know if he will ever see him again

But as the son was waiting near the front door the phone rang but they weren't supposed to answer it otherwise they might die?