Fifteen years after Corvo Attano restored Emily Kaldwin to the throne following the assassination of her mother, Dunwall has prospered under her reign. However, a serial killer by the name of the "Crown Killer" has been brutally murdering Emily's enemies, leading many to believe that Emily and Corvo are responsible. During a ceremony in remembrance of Jessamine Kaldwin's assassination, Duke Luca Abele of Serkonos arrives with the witch Delilah Copperspoon, who claims to be Jessamine's older half-sister and the true heir to the throne.