Characters in The Fourth Monkey

Sam Porter

A veteran Chicago homicide detective, lead investigator on the 4MK task force, drawn into the killer's mind through a diary left behind for him.

Also in The Fifth to Die, The Sixth Wicked Child

Brian Nash

Porter's wisecracking, loyal partner on the 4MK task force, whose humor and junk-food habits mask sharp investigative instincts.

Also in The Fifth to Die, The Sixth Wicked Child

Clair Norton

A detective on the official 4MK task force with an unconventional undercover background, working the case alongside Porter and Nash.

Also in The Fifth to Die, The Sixth Wicked Child

Edwin Klozowski

Nicknamed Kloz, the task force's irreverent tech specialist, who uncovers that the killer's cover identity was built on forged credentials.

Emory Connors

A teenage girl abducted by the Four Monkey Killer, whose ordeal in captivity gives readers a direct view of the killer's methods.