The death of a Russian diplomat's son causes international politics and espionage to interfere with Beckett's investigation of the case.
- An Arm and a Leg: Vasily threatens to chop off Jurgen's feet if he doesn't tell everything he knows about Grigori's death.
- Awesomeness by Analysis: Castle is able to determine that "Frank" wanted to infiltrate the party at the Russian consulate just by finding a receipt from a lamination shop.
- Beware the Silly Ones: Beneath Vasily's cheerful demeanor lies a ruthless secret agent.
- Diplomatic Impunity: The initial suspects are a group of young adult children of diplomats who exploit their immunity to get away with all sorts of minor crimes.
- Faking the Dead: Grigori's mother Anya actually faked her death in order to continue her investigation into her husband without his interference.
- Offing the Offspring: Grigori was killed by his stepfather after he found out the truth of his mother's survival.
- Slashed Throat: How Grigori is killed.
