Polly Lee

A 10-year-old girl, separated from her family at the US-Mexico border, ends up in a New York sex-trafficking ring. Benson and Stone battle to reunite her with her mother.

Dr Halstead's father gets admitted to the hospital against his wishes. Dr Charles steps in when his daughter's odd behaviour increases. Dr Manning feels the effects of being a working mother.

A crucial flaw during a mission forces Philip, Elizabeth, William, and Gabriel to confront both their mortality and the depths of their patriotism.

Philip must take stock of his life with Martha and make a difficult choice, from which there is no return.

Both the FBI and the KGB race to try and find an important agent. Oleg and Tatyana search for a pilot to take Martha out of the country.

When the situation with Tuan takes an unforeseen turn, Philip and Elizabeth are thrown off track; Henry makes a surprising proposition; Stan encounters Frank Gaad's widow.