A simple, powerful book for children, about an absent father and the love he leaves behind

Every morning, I play a game with my father.He goes knock knock on my doorand I pretend to be asleeptill he gets right next to the bed.And my papa, he tells me, "I love you." But what happens when, one day, that "knock knock" doesn't come? This powerful and inspiring book shows the love that an absent parent can leave behind, and the strength that children find in themselves as they grow up and follow their dreams.