Luc and Dan, two high school students at a Denver boys' school, meet in the late 1970's during the glitz and glitter of the disco era, and despite society's censure of gay love, they, with the help of Luc's ex-marine aunt, become enamored with each other. Oh, Danny Boy vividly describes their passion as it evolves into an intense love for each other while they become mature young men. This story of their lives is set in Colorado, New Orleans, and Hawaii, as well as San Francisco, where Luc struggles to resolve his doubts about his devotion to their relationship. Can he return to Dan and commit himself to the monogamous union Dan wants while they both complete college to become successful professionals, Luc a banker, Dan a famous lawyer? Neither can foresee the impact his decision and a looming pandemic will have on their lives.