Star Trek: Day of Honor, book 06 : Honor Bound
Diana G. Gallagher1997

There is no occasion more sacred to the Klingons than the Day of Honor. And to the Klingon youth, honor is a lesson heard-learned and harder-earned. The hunter instinct is taking over Alexander, driving him to violence when he can't control his emerging Klingon traits. He's in trouble at school when his father, Worf, gives his word as a Starfleet officer that Alexander's behavior will change. But it takes a frightening confession from Worf before Alexander understands that he must learn to control himself or lose everything he loves. A Klingon is honor-bound to keep his word, at any cost. And Alexander is about to pay the price as he faces disgrace and dishonor for challenging his bullying classmates with character instead of force.