Merlin is drawn to a distant village when a mysterious illness strikes. However, it soon becomes clear that something sinister turns the air sour and that there is much more at stake than just his own well-being. Far from home and having to fare by himself, Merlin becomes entangled in a deadly game of cat and mouse where he can trust no one.
Merlin is a young warlock who arrives in the kingdom of Camelot after his mother arranges for him to stay with the court physician, Gaius. He discovers that the king, Uther Pendragon, has outlawed magic and imprisoned the last great dragon deep under the kingdom.
The dragon tells Merlin that he plays an important role: to protect Uther's son, Arthur, who will bring forth a great kingdom. When Merlin meets Arthur, he believes that he is arrogant and Arthur, likewise, views Merlin as subservient. Merlin must keep his magic secret or face being executed by Uther.