In the near future, Callum Lynch, a man entangled in a dark criminal past, wakes up not remembering how he ended up in a secret laboratory of a powerful organization. Here, he discovers that he has been chosen to participate in a revolutionary experiment that uses advanced technology to access the memories of his ancestors. Through a device called the Animus, Callum becomes a member of the legendary Order of Assassins, a society that fights for freedom against oppression, all set in 15th century Spain.
As Callum explores the feats of his ancestor Aguilar, a skilled assassin, he becomes immersed in an epic war between the Assassins and the Templars, who seek to control everything through an ancient artifact that grants absolute power. While experiencing incredible abilities and spectacular combat, he also begins to uncover secrets about his family and his connection to this ancestral struggle.
With unexpected twists and a sense of urgency, Callum must confront the modern organization that holds him captive, led by the enigmatic Sofia, who has her own plans for him. As the line between his reality and the past blurs, Callum must decide whether to join the Assassins in their mission to free humanity from tyranny or succumb to the abyss of control. He will unearth secrets that could change the course of history, but at a steep price.