An acerbic state investigator who works with Lucas and presses authorities to recognize the apparent connection among several brutal attacks on women.

A meticulous cat burglar and killer whose fixation on Sara Jensen disrupts his ordinarily careful pattern and draws the investigators’ attention.

Lucas’s live-in lover, a surgeon who saved his life about a year earlier and accompanies him on runs.

A woman whose apartment Koop enters while she sleeps; he becomes infatuated with her despite never previously having seen her.

The Minneapolis police chief who appoints Lucas deputy chief to assist with prominent cases and manage potentially disruptive media attention.

A well-dressed woman Koop meets at The Saint bookstore and arranges to join for drinks farther down the street.

Sara Jensen’s boyfriend, whose relationship with her intensifies Koop’s anger and causes the normally careful killer to act openly.