An old army buddy and fellow surgeon visits Conrad at the hospital; the team is put to the test when they have to save the life of an uninsured and undocumented patient.
When a homicide case ends in a hung jury, Erin is forced to take over the case from her colleague and find a missing witness.
For former federal agent Erica Shepherd (Jennifer Carpenter), there are two sides to every treason.
Once Shepherd convinces Keaton that Anna Cruz is a mole inside the FBI working for Tal, Keaton decides to keep his enemies close; with a fox in their henhouse, Keaton and the team spy on one of their own, hoping Cruz will lead them to Tal.
When a former CIA operative is murdered, Keaton enlists Shepherd to help recover valuable intel that could take down Tal once and for all.
