Whistling warmed my heart. A father camps out under the stars with his son. He has something he wants to teach him. Anticipation increases until, finally, in the end the boy realizes he has the ability to do what his father has been teaching him.

This is a great father son bonding book. It is also a wonderful book on persistence. Believe it or not, God speaks about whistling for his people. See below:

Zechariah 10:8

“I will whistle for them to gather them together, For I have redeemed them; And they will be as numerous as they were before.”