Protest (S02E16)

Don and his team investigate a deadly anti-war bombing which bears the stamp of a 1970s anti-war activist who went missing 30 years ago after being accused of planting a bomb that killed two people. Retired Agent Thomas Larson, who tried to solve the case 30 years ago, turns up to help, but questions Don's loyalty to the case when it is revealed that Don's father, Alan, knew the radical activist and participated in demonstrations with him, causing tension between father and son. (iTunes)