Rock Creek Park

Reid: "The truth is rarely pure and never simple." Oscar Wilde.

A congressman's wife has gone missing, and he asks BAU to help him find her. Reid assists in surveilling Russian gangsters.

Tropes in this episode

Evil Matriarch: The congressman's mother turns out to be behind the kidnapping. Interestingly, when all is said and done, he goes to visit her in prison and asks for her advice on how to proceed, conceding that her plan worked.
Good Scars, Evil Scars: Paul, the congressman's brother, has a noticeable scar on his face from accidentally having boiling oil poured on him when he was a child.
Hostage Video: The team receives one of Sophie Troy, the congressman's wife, demanding 20 Million for her life.
Psycho Ex-Girlfriend: The congressman's former intern turns out to be one of those.
Samus Is a Girl: The person behind the kidnapping turns out to be a woman.
Secret Relationship: Reid is surveilling a duo of Russian gangsters. He is just about to blow his cover because they threaten their cleaning lady when one of them kills the other. It turns out that the surviving gangster is in a relationship with the cleaner.
Spoiler: Reid spoils the ending of Great Expectations for his surveillance partner.