Zach Patterson holds the position of Chief Inspector in Scotland Yard's Criminal Investigation Department. He operates as William James Moriarty's covert insider, supplying critical investigative intelligence to further Moriarty's objectives. His promotion to CID head cemented his essential role within Moriarty's operations, granting him superior access to case details and command structures. Simultaneously, Patterson functions as an MI6 informant, surveilling William's activities and reporting directly to Albert James Moriarty. Following William's disappearance and Albert's exit from MI6, Patterson continues his diligent service for MI6 while retaining his Scotland Yard duties. Patterson presents as tall with short black hair, dark green eyes, and wears thin-framed square-lens glasses. His standard attire is a dark blue three-piece suit paired with a purple tie. His personality is quiet and observant; he favors providing support from the background over direct involvement, a disposition well-suited to his informant role. He exhibits proficiency in deception and maintaining a low profile, demonstrated when he recovered evidence against Arterton alongside James Bonde without alerting his former partner, George Lestrade. Patterson's background includes a prior investigative partnership with George Lestrade at Scotland Yard, preceding Arterton's dismissal. His professional collaborations extend to working with James Bonde on operations like the Arterton evidence recovery. His dedication to rooting out corruption within Scotland Yard aligns with his dual allegiances to both the Moriarty faction and MI6. Notable personal details include his preference for little cigars and aversion to sweets. He harbors a minor concern over his inability to finish skincare products given by Bonde after requesting help for dry skin. The character originates from Inspector Patterson in Arthur Conan Doyle's "The Adventure of the Final Problem," where he convicts members of Moriarty's gang.