The only son of Elliott and Alice Hubbard, Horace is protagonist Paul Christopher's much younger cousin. He lives with his mother after his parents' divorce, attends Yale University and joins The Outfit. He is tall and gangling, resembles his father but has mannerisms like the ability to mimic, which come from his mother. Paul meets him after many years, as Horace works his first assignment under Barnabas "Barney" Wolkowicz, tracking a suspected Soviet spy inside British intelligence in Washington, D.C. Horace is next posted to Vietnam, and finally to Peking. He is on hand when Paul is released from ten years in a Chinese prison. Horace attends the annual dinners commemorating missing companions and Paul's confinement and takes part in Barney's arrest for spying.