The First Templar follows the story of two main characters - a French Templar, and his companion, a noble lady who has been proclaimed a heretic. Taking control over these two unlikely allies, the player must uncover the mysteries behind the Templar Order, play a role in a grand conspiracy, and discover the secret of the Holy Grail. The heroes face powerful opponents at every turn, in the face of the Saracen, King Philip IV of France and the Inquisition.
The game also features both single player and co-op modes. When playing solo, the player can switch between the two characters, leaving the control of the second hero to the game's AI. At any moment a second player can joinin and take control of the AI controlled hero.