Deadline revealed that the proposed spin-off would involve the Chicago Police Department, and would be created and executive produced by Dick Wolf, Derek Haas, Michael Brandt, and Matt Olmstead.

[12] Patrick Flueger and One Tree Hill star Sophia Bush joined the cast as Officer Adam Ruzek and Detective Erin Lindsay respectively.

[15] Stella Maeve was cast in the recurring role of playing Nadia, a pretty 18-year-old escort who is addicted to heroin and goes through a very difficult withdrawal.

[17] Sydney Tamiia Poitier was to guest star in five episodes as a Detective, who would eventually crossover on to the parent series, Chicago Fire.

Sergeant Hank Voight of the elite Intelligence Unit at CPD 21st District and his team of detectives investigate brutal slayings by an assassin who is linked to a group of Colombian drug dealers.

Veteran undercover Detective Alvin Olinsky recruits Officer Adam Ruzek from the Police Academy, having worked with his father years before.

Voight returns to the prescient and immediately fights Lieutenant Bruce Belden at the district, forcing other officers to intervene, physically restrain and separate the two men.

After the suspect is in custody, Antonio receives a phone call from his wife, Laura, informing him their young son, Diego, who has been working at a bakery his mother owns has been kidnapped.

Meanwhile, Erin asks Halstead to go undercover as her extremely successful fiancée at her high school graduation and reveals her past to him going back to when she was a CI for Voight, who took her in when she was living on the streets.

The DVD release features bonus material such as audio commentaries on some episodes from the creator and cast, deleted scenes, gag reels and behind-the-scenes featurettes.