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In the third episode of , titled " The Prisoner ," Leonardo da Vinci faces a classic clash between science and superstition when a convent of nuns appears to be suffering from "demonic possession". Episode Highlights

We see the beginning of a mutual respect (and occasional rivalry) between Leonardo and Giuliano Medici , as they both investigate the convent's horrors. Da_Vinci_s_Demons_1x03_Il_Prigioniero_ITA_ENG_D...

While the church claims the nuns are possessed and attempts violent exorcisms, Leonardo applies logic and forensics to find a rational cause. He eventually identifies the culprit as an ergot infection (a fungus often found on rye) that causes hallucinations and convulsions. In the third episode of , titled "

Leonardo uses fireflies to track the source of the "possession" in a method similar to modern UV lighting, discovering that a tainted altar was the common link among the victims. He eventually identifies the culprit as an ergot

The episode emphasizes that "demons" are often just misunderstood natural phenomena.

The mystery hits home when Leonardo's close friend Vanessa falls ill, forcing him to race against time to provide an antidote. Key Themes

In Rome, Count Riario meets with a hooded figure held in the Pope’s secret prison. This prisoner teaches Riario strategy through the ancient Chinese game of Go , hinting at deeper conspiracies surrounding the "Book of Leaves".