Returning to the end of episode one, an inebriated Gacy confesses to Sam the ways he groomed, raped, tortured and killed countless boys and young men.

Michael wants to help a woman he once romanced under Division orders, who is in danger.

Jane and the CBI team narrowly escape a fiery end when a building explodes while they're investigating a death threat. Meanwhile, sparks fly between Lisbon and billionaire Walter Mashburn when they meet again while on the case.

When Jane is kidnapped, Lisbon and the team realize there are many suspects who might want to harm him.

Charles and Archer treat a heart transplant patient who believes his new heart doesn't want to be in his body. Lenox takes a personal day. Asher discovers a mass on a pregnant woman's ovary.

Hannah makes a tough call to save a life. Frost and Ripley treat a young boy with a snake bite. Archer gives Naomi a patient to handle on her own on her last day in the E.D.

Jane and the CBI team narrowly escape a fiery end when a building explodes while they're investigating a death threat. Meanwhile, sparks fly between Lisbon and billionaire Walter Mashburn when they meet again while on the case.

When Jane is kidnapped, Lisbon and the team realize there are many suspects who might want to harm him.

Charles and Archer treat a heart transplant patient who believes his new heart doesn't want to be in his body. Lenox takes a personal day. Asher discovers a mass on a pregnant woman's ovary.

Hannah makes a tough call to save a life. Frost and Ripley treat a young boy with a snake bite. Archer gives Naomi a patient to handle on her own on her last day in the E.D.

Ruzek grapples with his father's worsening condition while Intelligence searches for an elusive serial killer.

Voight questions Deputy Chief Reid's motives in enacting a Violence Reduction Initiative across a neighbourhood where numerous gangs are fighting for territory.

Jane and the CBI team narrowly escape a fiery end when a building explodes while they're investigating a death threat. Meanwhile, sparks fly between Lisbon and billionaire Walter Mashburn when they meet again while on the case.

When Jane is kidnapped, Lisbon and the team realize there are many suspects who might want to harm him.

Charles and Archer treat a heart transplant patient who believes his new heart doesn't want to be in his body. Lenox takes a personal day. Asher discovers a mass on a pregnant woman's ovary.

Hannah makes a tough call to save a life. Frost and Ripley treat a young boy with a snake bite. Archer gives Naomi a patient to handle on her own on her last day in the E.D.

Voight questions Deputy Chief Reid's motives in enacting a Violence Reduction Initiative across a neighbourhood where numerous gangs are fighting for territory.

Patrick Jane accepts the help of a local astrologer, Ellis Mars, to solve the puzzling case of a triple homicide that involves two policemen and the fiancé of an EMT worker.

The CBI pursues two lines of investigation when a Santa is murdered. Meanwhile, following the demise of a person in custody at the CBI, J.J. LaRoche is brought in to question the team when it appears to be an inside job.

Maggie and Goodwin's friendship is tested as tensions rise during the nurses union's negotiations with the hospital. Ripley and Archer treat a skateboarder struck by an emergency vehicle. Frost helps a young boy abandoned by his mother.

Maggie and Goodwin's friendship is tested as tensions rise during the nurses union's negotiations with the hospital. Ripley and Archer treat a skateboarder struck by an emergency vehicle. Frost helps a young boy abandoned by his mother.

This episode explores the death of All-American cheerleader Tristyn Bailey, who was killed by 14-year-old Aiden Fucci in 2021.

Kunkle and Sam are knee-deep in trial; Tovar drives Gacy; Gacy's past grooming of Cram is revealed.

Jeffrey Rignall's story is told; Gacy's execution day brings protests, reunions and moral debates.