Now that the boys of summer are heading into fall, there comes a fine and insightful book for all ages. “A Coach’s Letter to His Son” (Creative Editions, $18.95) is more about father-son relationships than baseball itself, and it will touch anyone who has ever played ball with his dad. Mel Allen, who’s been an editor at Yankee for more than 25 years, wrote this lovely volume; John Thompson, winner of the 2006 Hamilton King Award — the highest achievement an illustrator can receive — illustrated the book. Mel has, as Yankee readers know, a way with words. He doesn’t disappoint here. To learn more, visit thecreativecompany.us.