Twelve-prodigy Rafal believes in living rationally so as to earn praise and respect from society while not being led astray by his emotions. To this end, he publicly states his intention to study theology—the academic field held in highest regard in early 15th-century Poland. However, an encounter with a mysterious man upends Rafal's life, sparking an illogical desire to pursue his passion for astronomy instead.Rafal is determined to prove the beauty and rationality of heliocentrism—the theory that the Earth revolves around the Sun. This belief is considered heretical by the powerful Church, which promotes geocentrism—the Sun revolving around the Earth—as the sole truth of the universe. Those whose beliefs do not align with the will of the Church suffer unfathomably gruesome consequences.In pursuit of evidence for a heliocentric model of the universe, Rafal grapples with obtaining precise calculations and building empirical theories. His greatest challenge, however, lies in conducting this research discreetly—lest he wish to meet the same fate as other heretics.
A gifted young student plans to study theology at university, but his true passion is astronomy. One day, he meets a mysterious scholar named Hubert.
Rafal is intrigued by Hubert's heliocentric theory. Later, Hubert is arrested by an inquisitor but he gives Rafal a pendant before being whisked away.
Nowak convinces Potocki to admit to Rafal's heresy. Once arrested, Rafal is given a choice: recant his belief in heliocentrism or submit to torture.
The duelist Oczy wishes for death so he can escape his hopeless world and go to heaven. His colleague finds meaning in life by observing the stars.
Gras aborts the mission, placing himself and Oczy in mortal danger from Nowak. They both flee for the mountains, where they find a stone chest.
Oczy seeks the help of Badeni, the demoted monk who incurred the Church's wrath by turning his curiosity to the riddles of the sky.
Gifted scholar Jolenta suffers discrimination as the only girl at an astronomy institute. Badeni seeks resources to prove the heliocentric theory.
Badeni offers Jolenta a chance to pursue the truth of the skies, but she is overcome with fear. Afterward, she overhears bold words from Count Piast.
A middle-aged Piast vows to prove his professor's geocentric model. In the present, he agrees to let Badeni use his records — on one condition.
Oczy tells Badeni that he is learning to read and write. Later, Badeni's claim that knowledge should be held by a select few bothers a fellow monk.
Nowak gives two rookie inquisitors a terrifying first taste of their new roles. Badeni meets with Jolenta and tells her he has completed his theory.
Nowak asks Badeni to show him his research. He inspects Badeni's premises but doesn't find anything incriminating — until he spots a certain item.
In a medical area within the inquisition chamber, a wounded Oczy awakes to see Nowak, who has kept him alive in hopes of extracting information.
Badeni must choose between revealing the location of the heretical documents on heliocentric theory or prolonging Oczy's torture at Nowak's hands.
Nowak believes his beloved daughter has been executed as a heretic. Father Grabowski comes across a letter from Badeni containing an unusual request.
Twenty-five years later, Captain Schmidt of the extremist Heretic Liberation Front infiltrates a church and steals an important item.
A young nomad woman haunted by poverty devotes her life to obtaining wealth. One night, she discovers the book that Frei hid in the abandoned village.
Bishop Antoni orders Draka to hand over the book, but Schmidt's men suddenly intervene. Determined to change her fate, she takes a bold action.
Hoping to track down the people who stole the book, an inquisitor seeks advice from Nowak, who now spends his days drowning his sorrows.
As the Heretic Liberation Front prepares to depart, Jolenta entrusts Draka with a letter. Soon after, Nowak and the inquisitors approach the barn.
Schmidt and the others regroup with their Liberation Front comrades and begin printing the book. However, a traitor brings their operation to a halt.
As Nowak's group attacks the Liberation Front, Draka and Schmidt begin their escape. Upon reaching town, Draka makes a proposition to Bishop Antoni.
A deluded Nowak turns against Antoni and attempts to burn down the church. Draka fights back and escapes but incurs a terrible wound.
Albert goes to deliver an order of bread to a church. While there, he encounters a mysterious priest who encourages him to confess his sins.
Albert leaves the academic gathering and returns home to an awful sight. In the present, the priest gives Albert advice and makes his own confession.
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