The Good Liar trailer still

Warner Bros. Pictures/YouTube

The upcoming thriller "The Good Liar" might scare you off online dating.

Warner Bros. Pictures released a new trailer Wednesday, and it shows off stars Helen Mirren and Ian McKellen as a pair that meets online. The concerning part is that McKellen's character, Roy, isn't exactly looking for a love. He seeks out lonely and wealthy widow Betty (Mirren) with a con in mind.

The trailer shows Roy's scheming. He tells a friend (Jim Carter) that he thinks Betty is worth nearly 3 million pounds.

"You bloody better bet I'm going to take it all," the conman says.

Roy doesn't seem to have planned for every possible scenario, though. The synopsis teases in part that he'll be "surprised to find himself caring about her, turning what should be a cut-and-dry swindle into the most treacherous tightrope walk of his life." Watch the trailer below.

"The Good Liar" is written by Jeffrey Hatcher and directed by Bill Condon. The film hits theaters Nov. 15.