Loyalties are divided when civil war splits the Klingon Empire. When Worf sees a chance to regain his wrongfully lost family honor, he must choose between his duty as a Starfleet officer and his heritage as a Klingon warrior. Meanwhile, Picard struggles to keep the Federation from being dragged into the fray. But a shocking new adversary from the past threatens to destroy both the Federation and the Klingon Empire.
Based on the true story of May Lemke. Her adopted son Leslie was born with cerebral palsy. May teaches him basic survival skills through the years. In his teens, he suddenly manifests an ability to play classical music on the piano.