Jason and the team feel conflicted when they are tasked with bringing home an American soldier who was captured after deserting, in exchange for detainees in Gitmo.
Detective Slaughter returns to enlist Castle’s help in solving a high-stakes robbery case, but later becomes the number one suspect.
After a van explodes during a Chicago street festival, a Muslim patrol officer Frank Toma goes missing and evidence quickly piles up pointing to his involvement.
Sam finds himself in the midst of a dangerous house call; Pete and Addison decide to take their relationship to the next level; Violet enters a friends-with-benefits pact with Cooper.
Charlotte asks Pete to treat her insomnia; Naomi has her first date since college; a patient wants Addison and Naomi to keep information about her fertility from her husband.
