Mark: [s3e7] The Perfect

Detective Terney (a corrupt HR cop) confronts Laskey and Carter. In the ensuing shootout, Terney kills Laskey.

Carter fatally shoots Terney. In his final moments, Terney identifies Alonzo Quinn (the Mayor's Chief of Staff) as the head of HR by pointing at a photograph. [S3E7] The Perfect Mark

Detective continues her dangerous undercover investigation into HR with the help of her mole, the rookie officer Mike Laskey . Detective Terney (a corrupt HR cop) confronts Laskey

The two storylines collide when HR discovers the missing money/baseball and goes after both Vanger and Price. [S3E7] The Perfect Mark

The episode concludes with a significant shift in the series' overarching HR plot: