Emily Kaldwin is dead, and The Isles are on the brink of civil war. Hiding from his guilt and shunning the Outsider, Corvo Attano serves the Duke of Serkonos as his "shadow" - but when the Duke is assassinated, and Daud implicated, Corvo is taken prisoner by a new High Overseer, and a mysterious High Oracle - who gives Corvo a horrifying and impossible task: destroy the Outsider.