Earl Brooks, a successful businessman and devoted family man, harbors a dark secret: he is a serial killer, guided by his alter ego, Marshall. Despite his efforts to quit, Brooks is compelled by Marshall's influence to resume his lethal habits. Meanwhile, Mr. Brooks is celebrated as a pillar of the Portland community, hiding his inner turmoil and addiction to killing beneath a veneer of normality. His double life begins to unravel when he breaks his own meticulous rules during his latest murder, leaving behind evidence that puts him on the radar of the police.

Detective Tracy Atwood, a talented but troubled investigator facing her own personal and professional challenges, takes on the case. She is determined to solve the string of murders, unaware of the true identity of the culprit she is chasing. As Mr. Brooks struggles with his compulsion, contending with Marshall's manipulation, he becomes entangled in a dangerous game of cat and mouse with Atwood. The situation is further complicated when a voyeur witnesses one of Brooks’ crimes, threatening to expose him. The boundaries between hunter and hunted begin to blur, setting the stage for a confrontation that could expose Brooks' meticulously guarded secrets.