On Christmas Eve, Jeff Hayes returned home from high school hockey practice, approached his mother, and uttered these life-changing words: "Mom, I think I have a tumor in my leg."

Jeff was diagnosed with Ewing's sarcoma, a rare and deadly form of bone cancer. Eventually, the disease would end his life, but to focus on his death is to miss the beauty of his life; it is to miss the countless lives he touched; his community rallying around him; his love of hockey and the kindness of the Boston Bruins.

Twelfth Knight is a wonderful story, beautifully told through a...