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.

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.