Patagonia, 1922. A hindi millionaire philanthropist and a basque scholar penetrate into the dark and unexplored mountain forests in search of an underground city, mentioned in ancient mapuche legends. Santiago Achotegui will be summoned to the encounter and for the task he will have to take with him all the knowledge and astuteness.

The search is real, but the challenge is unimaginable.
Prepare yourself to prove your cunningness and your capacity of amaze, and go with the main character into an epic journey trough a dark world full of hidden mysteries with a glance that reminds the best tales of H.P. Lovecraft.