Set in the 19th century, the story follows Oberlus, a disfigured sailor with a hideous skin condition that makes him resemble an iguana. Shunned and cruelly mistreated by his shipmates because of his appearance, Oberlus escapes to a remote island off the coast of South America. Determined to turn the tables on his tormentors, he declares himself ruler of the island and creates his own kingdom built on fear and subjugation. The island becomes a haven for outcasts and criminals who pledge loyalty to Oberlus or face brutal consequences.

As he tightens his grip on his dominion, Oberlus' reign of terror spreads beyond the island, affecting passing ships and travelers. His hatred toward humanity intensifies, leading him to commit increasingly violent and oppressive acts. However, the lives of those who cross paths with Oberlus intertwine in unexpected ways, revealing complexities in their struggles for power, survival, and redemption. Human nature's darkest and most compassionate sides are laid bare as the characters navigate the treacherous dynamics of their relationships and confrontations with Oberlus.