Castle is rattled to discover his "little girl" is dating Ashley, whom he initially thought was a girl. The realization that she is experiencing her first love leads to a touching father-daughter heart-to-heart.

Castle and Beckett even head to the firing range to test antique flintlock pistols, leading to a hilarious montage where Castle realizes these "classic" weapons are anything but accurate.

The "punking" isn't just limited to the crime scene; both Castle and Beckett are dealing with major shifts in their personal lives:

When a young mathematician is found shot to death in Central Park with a 200-year-old lead ball, Richard Castle immediately leaps to his favorite conclusion: . But while the investigation doesn't involve a flux capacitor, it does lead the team into the brass-and-gear-filled world of New York's steampunk subculture. The Case: A Duel to the Death?

The episode concludes with a dedication to the legendary Stephen J. Cannell , a real-life author and friend of the show who frequently appeared in the "writer's poker" scenes.

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