The final entry to the Cognition series, has Erica pursuing both Cordelia and the Cain Killer while keeping the player unaware of John's fate. Through flashbacks we learn more of Erica's past with John as FBI agents. Meanwhile Mac Adams is trying to arrest Erica and she must convince him to help her one last time. To this end the series introduces a "trust meter" which depends on Erica's actions she may be lose her former boss' trust completely. Unlike previous entries, episode 4 is overall shorter and more contained than previous episodes, focusing mostly in a linear story-telling structure.