Halstead and Lindsay get dressed up to get some intel form a underground sex club.

Season 2 Episode 8 "Assignment of the Year"
Dawson's after hours private security job takes a bad turn when the man he was protecting is killed, which could also cost him his job as the client turns out to be a diamond smuggler. Voight and the rest of the Intelligence Unit go to great lengths to solve the crime and save him. They catch the killer, but not the victim's wife who devised the plan. To save Dawson's badge, Voight and Olinsky resort to falsify the documents of an investigation into the victim.

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