The protagonist-physician, Dr. Aira, is an almost 50-year-old sleepwalker who resides in Buenos Aires. He's nearsighted, introspective, and paranoid. Dr. Aira's fame stems from his "miracle cures" - even though it's not clear that he's ever actually performed one. Dr. Aira does not believe in God.

His initial encounter with "paranormal medicine" occurred during childhood when dog owners in his town were led to believe that by submitting themselves to a lengthy set of penicillin injections their pets would be painlessly neutered. Acknowledging the absurdity of that situation, he remained intrigued by the "possibility of action from a distance" (p10) and the lure of magical healing.

Dr. Aira's nemesis is Dr. Actyn, Chief of Medicine who tries to ridicule Dr. Aira and debunk his claims. Dr. Actyn sets elaborate traps including one with a "dying" actor on an ambulance who Dr. Aira refuses to cure.

Dr. Aira obtains enough money to devote 10 months solely to writing his secrets and eventually self-publishing his knowledge in the form of pamphlets. His plan is interrupted by an urgent request to perform a miracle cure on a terminally-ill cancer patient. He consents and makes a house call to treat the wealthy man. After one hour of intense deliberation and theorizing, Dr. Aira's work is complete. Laughter erupts. The "patient" is a fake. It's his archenemy Dr. Actyn in disguise. Dr. Aira's failure is captured on camera.