Atahualpa works on the construction of a road that will cross the Llanganates Mountain Range, where it is said that the treasure of Inca Atahualpa was hidden in 1533. One night, Atahualpa is the guide of an expedition that goes in search of the treasure at the beginning of the 20th century.

Iris and Ariel are 17-year-old twins, who live with their mother and older sister in an old house in the middle of a rocky island covered with molluscs and birds. The teenagers have grown up isolated from the mainland, in a sibling relationship that surpasses the limits of normal intimacy. The abrupt absence of their mother deeply wounds the three siblings, and Iris, moved by a strong need of separating herself from her brother, decides to go alone to the city for the first time.