A former drug addict insists she saw her son in a park three years after he allegedly died in a fire.
The team goes on a mission to confirm whether an international crime lord has resurfaced.
Willis and Campbell travel to a Russian submarine to treat a sailor who has been wounded in an explosion; the staff at Angels Memorial treats violent criminals who got injured during a prison riot.
With the arms control summit under way, a shocking revelation from Philip throws Elizabeth - and her work - into turmoil. Stan follows a dangerous hunch.
In the aftermath of a disastrous operation, Philip and Elizabeth clash about how to handle things with Paige. Stan struggles to contain the growing risks of Sofia and Gennadi’s fraying relationship.