Infiltrator by W. R. Thompson

This collection of excerpts centers on a tense first contact between the Federation and the isolationist Heran civilization, revealing the Herans as a race genetically engineered from ancient human stock. The narrative details the Enterprise crew's investigation into Heran actions, including a biological attack and mysterious sabotage, with Lieutenant Worf and Counselor Troi playing key roles. A central figure is Dr. Astrid Kemal, a Heran refugee with enhanced abilities, whose true nature and connection to her people's origins become critical to understanding the conflict. The story explores themes of prejudice, genetic engineering, diplomacy, and warfare, culminating in complex negotiations and the potential for a new understanding between these distinct human factions.