An NYPD homicide detective and former first responder during the 9/11 attacks, Bradley is deeply committed to his principles and has a happy marriage that offers Murdoch a vision of a life of stability and connection.

The primary antagonist, al-Nassouri is a skilled doctor and radical extremist with a personal vendetta stemming from family trauma and political radicalization.

A competent Turkish detective with familial ties to Murdoch's antagonist, she is initially at odds with Murdoch but plays a crucial role in his investigation.

The director of national intelligence, McKinley serves as a mentor to Murdoch, guiding him through complex and morally challenging situations.

Murdoch's wealthy foster father who dies before the novel's current events, providing him with moral guidance and a sense of familial love despite a life of espionage.