A superstitious young man who courts La Bella Medusa. He gambles to win money for her and her mother, succeeding after receiving advice from Professor Mantua. Later revealed to be the ghost of an archaeologist, he becomes attracted to Inés, assists her investigation, discovers an underground hunchback city, gets captured, escapes, and returns with police.
A romantic connection forms as Inés relies on Basilio's courage to navigate the underground conspiracy.
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