NGTV Guide: Monday, September 28

It’s high-stake auctions and murder in New York City tonight. I’m betting on Blair and Castle, respectively.

Gossip Girl – the CW 9/8c
“The Lost Boy” – It’s an Upper East Side face-off when Blair and Chuck both set their sights on a particular item up for bid at Sotheby’s and the personal stakes are high. Serena suspects that Carter (guest star Sebastian Stan) may be up to his old habits, Georgina takes an interest in Dan, and Vanessa begins to suspect that something isn’t quite right with Scott (guest star Chris Riggi).

Castle – ABC 10/9c
“The Double Down” – When two separate murders are committed on the same night, Castle wagers Ryan and Esposito that he and Beckett will solve theirs first. The frenzied race to catch their respective killers and win the bet leads each investigative duo to a likely suspect, only to find that they both have airtight alibis. But bizarre twists in both cases force the two teams to work together to unravel the mind-bending mystery behind each murder.

Premiering Tonight:

Lie to Me – Fox 9/8c