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A student from Boston, Massachusetts, Alannah was recruited by William Miles into the Assassin Order at some point in 2017. In August, Alannah was one of the candidates chosen by a fellow Assassin Layla Hassan to accompany her on a mission to Quebec due to her expertise on ancient documents and church construction. However, as she was still in training, Alannah was not allowed to accompany Layla.
In 2018, Alannah became part of Layla's cell in search for historical artifacts, in particular the Lost Book of Herodotos. Alannah served as the team's historian, providing historical details regarding Herodotos to Layla while she relived the memories of the Spartan misthios, Kassandra.
- In Assassin's Creed: Odyssey, after Alannah told Layla that her grandpa's grandpa was an Irish sailor and adventurer, Layla commented that Alannah makes her own luck. This could imply that she is descendant of Shay Cormac, an Assassin who defected to the Templars, who was of Irish descent.
- Alannah is also fluent in English, Latin, ancient Greek, and Sanskrit.