Remember the Devil

S4 E1703/22/17
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The team tries to catch a kidnapper whose victim isn't telling the full truth; Halstead hides a heartbreaking secret from Lindsay; Olinsky returns after suffering the loss of his daughter.

Emotional Proximity

S4 E1603/01/17
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Voight and team conduct an investigation in search of an arsonist who killed dozens of partygoers in a factory fire; meanwhile, Olinsky copes with the possibility that his daughter will never wake up from her coma.

Favor, Affection, Malice or Ill-Will

S4 E1502/22/17
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On a tip from Lindsay's informant, Olinsky plays hit man to catch a man who wants to avenge his daughter's death; when it turns out his target is innocent, the team scrambles to find the real killer. Meanwhile, Ruzek's return shakes up the precinct.

Seven Indictments

S4 E1402/15/17
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A case of mistaken identity reveals a lifetime of deception; Platt faces a shocking health scare; rumors circle the team about one of their own, who may not be as trustworthy as he seems.

I Remember Her Now

S4 E1302/08/17
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After a resident of a young women's treatment center turns up dead, Halstead takes on an uncomfortable undercover assignment that puts his loyalties to the test.

Sanctuary

S4 E1201/18/17
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Two young murder suspects achieve sanctuary in a church, leading to a standoff between Intelligence and parishioners and attracting heavy media attention; Voight will stop at nothing to ensure the victim's killer is brought to justice.
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