After Yale he sets out for Endura Texas. However, he finds 1872 Endura Texas a battleground like the New Haven he left. Victor Vlack, cattle baron and Endura’s largest landowner runs for state congress to thwart Endura becoming a city. Opposition to Vlack’s murders, pillaging and barbed wire oppression comes from Cotter and his physician colleagues. Cotter becomes his vigilante alter ego to confront Vlack’s moves. Cotter also finds his father’s killers working for Vlack. Vlack targets his Clinic and his staff for destruction. This includes his ether anesthetist, Mortimer Pignast, who runs for election against Vlack. Cotter falls in love with the Clinic’s widowed head nurse and her children. He’s torn between being a humanitarian physician, family man and his quest to avenge his father’s murder.