Film based on the life of Dr. Salvador Mazza, who, with a group of professionals, conducts an investigation to discover the antidote to a mysterious illness whose carrier is a nocturnal insect. A Mazza was regarded as the first doctor who fought the deadly Chagas disease in Argentina.

The life story of Argentine sculptress Lola Mora.

Gastón (Carlos Echeverría) arrives in Necochea. There he meets Julia (Leticia Bredice), a young veterinarian who, after discovering that the foot-and-mouth disease vaccines are adulterated, is found hanged in a shed. He will be blamed for the crime and will try to understand what happened, while avoiding being lynched.