Blue Murder

Pogue and Oosterhuis investigate when a young girl named Erica Warner is taken from in front of a local store, with her older sister Shannon as the only witness. While Oosterhuis questions Shannon, he can't help but see similarities between the two of them, because when he was 13 he once lost track of his little brother at a carnival for a few hours and felt responsible for years. The squad soon realises that Erica's disappearance as a lot in common with that of a young girl who disappeared three years earlier, and they're determined to find Erica and stop the kidnapper before he can take another young girl from her home.

When Amber Watley calls to report the body of a young man by the tracks, the squad immediately moves in to investigate, but it doesn't take long before Weeks and Gillam realise that there is no way it happened the way that she said it did. As the squad continues to investigate the death of Donnie Tenio, they soon discover that the problems in the group of teens go far deeper than they could have imagined.

A man is found in a parking garage, beaten and amnesiac, with only a book of bird drawings to identify him. Pogue takes the book to his wife Carolyn in the hopes that she can identify the birds and narrow down where the man is from, and in exchange for her helping, Pogue ends up having to spend a great deal of time looking after their daughter Cara, much to Oosterhuis' frustration. While Weeks and Gillam focus on dealing with the patient, who has taken a shine to Gillam, they soon locate his wife, only to learn she's not the only Mrs. John Doe.

When the body of a male escort is found, Pogue and Oosterhuis get the call. Initially confused as to why they're called in, the reporting officer reveals that Barrow's business card was found on the body. While investigating the crime and trying to clear their boss, Pogue and Oosterhuis soon realise that the man's death had less to do with his profession and more to do with a pending legal action against a former employer. Gillam thinks she has finally found her Mr. Right in Christian, a former high-school classmate, but Weeks is immediately suspicious of Chris, and when doing a background check, Weeks ends up getting himself beaten by thugs who are pressuring Chris to get information from Gillam.

Fourteen years earlier, a fifteen-year-old girl named Alicia Turner was murdered, and a seventeen-year-old named Nick Randall was convicted of her murder. When Tommy Granato claims Randall is innocent, Barrow asks the team to take a look into the investigation because that was her first major case. The squad soon nabs a three-time loser named Al Snedden who points them to his former cellmate Wally Maestre, swearing that he confessed to the murder. When Snedden gives the squad information that only the killer could know, the squad turns all their eyes on Maestre, yet his sister Bonnie provides him with an iron-clad alibi.

When pretty blonde Patsy Grady is found dead in the passenger seat of her husband's car, the squad initially can't figure out any possible reason why someone would kill the young woman, but as they investigate the case, the squad realises that Patsy was not only unfaithful to her husband, the paternity of her child was in question. This leads them to playboy Malcolm Harding, who is quick to point out that he has no reason to kill Patsy because he had a vasectomy. Meanwhile, Pogue and Oosterhuis investigate when Carolyn reports that there has been a man calling her and making obscene threats for the last few weeks. Oosterhuis tries to convince Pogue to back off, but he's determined to fix the problem, even if it means spending more time than he should with Carolyn.

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When diamond courier David Ramsey is found burned to death with his hands barb-wired behind his back and a tire around his body, Oosterhuis realises that he is killed in a traditional South African style, and he and Pogue wonder if someone was trying to send a message. Weeks and Gillam investigate the death of a small child who shows a history of physical abuse when their medical examiner tells them that he disagrees with the coroner's report that the mother caused the child's death, especially considering the child wasn't even with the mother when the fatal blow was struck.

When Blair Patterson's beheaded body is found in a van that's been sitting in a neighborhood for days, his wife turns the squad onto Emily Glover, a tenant in the apartment building Blair managed, who immediately confesses to his murder and claims she and Blair were killing couples throughout the city. When another couple is found dead in the same way as the others, the squad realises that something with Emily's story is off, and it's up to Oosterhuis to try to get it out of her as Emily will not talk to a female detective, and has already given up on Weeks.