In 1752,
Shay Patrick Cormac (Steven Piovesan) is a new recruit to the Colonial Brotherhood of Assassins, whose potential is offset by his
insubordination. While Shay trains with the North Atlantic chapter under the Assassin Mentor Achilles Davenport (
Roger Aaron Brown), the Assassin
Adéwalé (Tristan D. Lalla) arrives with news that
Port-au-Prince was devastated by
an earthquake during the search for a Precursor temple. Due to his experience captaining ships, Shay is tasked to retrieve a Precursor box and manuscript from the Templars. However, Shay begins to question the Assassins' motives after they refuse to engage in dialogue with the Templars, instead ordering Shay to assassinate them regardless of circumstance. In 1754, after recovering the box and manuscript, Shay delivers them to
Benjamin Franklin (Rick Jones), whose
experiments on the box generate a map showing the locations of more Precursor temples around the world. Ordered to investigate a temple in
Lisbon, Shay inadvertently triggers a
devastating earthquake when he tries removing the artifact at its center, leaving him guilt-ridden and remorseful for of all the innocent lives he accidentally killed. Deducing that Port-au-Prince was destroyed similarly, Shay confronts Achilles, and is horrified to learn that Achilles intends to continue the search for Precursor artifacts, thereby endangering even more lives. Shay steals the manuscript and attempts to escape with it, but is cornered by the Brotherhood. Shay is shot and left for dead before he can destroy the manuscript. Cast adrift, Shay is found by Colonel
George Monro (Graham J. Cuthbertson), who saves him and leaves him in the care of Templar sympathizers in
New York. After recovering in 1756, Shay cleans out Assassin-allied gangs that are extorting the citizenry, catching Monro's attention, who convinces Shay that he can improve the lives of others. Upon retaking his ship, the
Morrigan, from the Assassins, and recruiting
Christopher Gist (
Richard M. Dumont) as his
quartermaster, Shay agrees to assist his newfound Templar allies. After the Assassins kill Monro to steal back the manuscript, Shay realizes the Brotherhood has not given up the search for Precursor temples, and begins hunting down its members, becoming a high-ranking Templar in the process. Over the following three years, Shay kills the Assassins Kesegowaase (Danny Blanco-Hall), Adéwalé, Hope Jensen (
Patricia Summersett), and
Louis-Joseph Gaultier de La Vérendrye (Marcel Jeannin), leaving only two prominent members of the Colonial Brotherhood: Achilles and his second-in-command, Liam O'Brien (Julian Casey), once Shay's best friend. Shay and the Templar Grand Master
Haytham Kenway (Adrian Hough) pursue the Assassins to the Arctic, where another Precursor temple has been located. After eliminating the Assassin expedition, Shay and Haytham enter the temple to find Liam and Achilles, who have realized that the artifacts are a means to stabilize the world, not a weapon to control it. During the confrontation, the artifact is accidentally destroyed, triggering another earthquake. As the four escape, Shay fatally injures Liam in a duel while Haytham overpowers Achilles. Shay persuades Haytham to spare Achilles, to ensure knowledge of the Temples is not lost, so the Assassins will not pursue them again. Haytham agrees, but cripples Achilles. Tasked by Haytham to recover the Precursor box from the Assassins, Shay spends the next sixteen years tracking it down. In 1776, with Benjamin Franklin's help, Shay infiltrates the
Palace of Versailles in France and kills the Assassin
Charles Dorian to obtain the box. He reaffirms his commitment to the Templar cause, and suggests that the Templars should soon start
their own revolution in response to
the Assassins' recent actions in America. In the modern-day, the player is an unnamed Abstergo Entertainment employee tasked with researching Shay's memories. During their investigation, the player inadvertently trips a hidden memory file that infects the Animus servers. Abstergo is placed in lockdown, and the player must clean the Animus servers by living out Shay's memories. Juhani Otso Berg (Andreas Apergis), a senior Templar, orders the player to upload Shay's memories to the Assassin servers, to weaken their resolve. The Brotherhood responds by cutting off communications. In a mid-credits scene, Berg thanks the player for their help, and gives them a choice: join the Templars, or die. The player's decision is not revealed. ==Development==