In temazcal uan in ilhuitl

Margarita and Evaristo, a peasant couple, live alone in their hut at the foot of the Malintzin volcano. Every day they wait for the Techiq bird to announce the return of their son, who migrated long ago in search of work and has not returned. One morning, Margarita falls ill, and a forest creature appears before Evaristo. Is it death, or something more?