Book 2: The Navigator and The Captain- A Love From 2 Ships

Sequel to The Anomaly. Serenity has introduced her navigator Taisallish, also known as Taisa, to her brother Jim. Romance ensues between the two, while Spock and Serenity raise their first child. Danger for both couples arise in the form of Khan, a man who survived Earth's Eugenics Wars, and is determined to succeed and accomplish his goals, through any means necessary.