The first scene of Halley Feiffer’s new drama is a bear trap. It seizes one’s attention and won’t let go. Feiffer, who stars as Cat, is having drinks and hors d’oeuvres with Guy, a restaurateur whose wife she has profiled for The New Yorker. He’s explaining to her his design of the Japanese restaurant they are in; as performed by Hamish Linklater, he is arrogant, charming, playful, insulting, and possibly dangerous. When he says to her, “I’m a serial killer,” and quickly follows it up with “I’m joking,” it’s not completely reassuring.