Jillian Clare goes a little goth in your first look at her appearance as Molly Quinn‘s best friend on Castle.

In the upcoming episode “Last Call,” hen the body of a dockworker turned bar owner is found floating in the East River, Castle and Beckett’s investigation takes them into the forgotten tunnels and passageways of turn-of-the-century New York, where they uncover a secret that’s been buried since the days of Prohibition. The story celebrates New York bar culture, setting Castle on a quest to preserve history by buying a bar of his very own.

Molly was also spotted at the 2010 Hollywood Christmas Parade with on-screen grandmother Susan Sullivan over the weekend.

“Last Call” premieres Monday, December 6th @ 10PM ET/PT on ABC.