Good Behavior Tuesdays, 9 p.m., TNT. Premieres November 15.

A few years ago, TNT’s original programming was filled with old-school procedurals like The Closerand Rizzoli & Isles, but over time the network has gotten rid of nearly all of them in favor of darker, more serialized crime dramas like Animal Kingdom and the new Good Behavior, starring Downton Abbey’s Michelle Dockery as a small-time thief and grifter. Based on a series of novellas by Wayward Pines author Blake Crouch, Behavior follows Dockery’s Letty Raines as she attempts to put her life together following a prison stint, only to be blackmailed into teaming up with suave assassin Javier (Juan Diego Botto).

Letty is a long way from Lady Mary Crawley, and Dockery is a little too proper to fully convey the character’s depths of drug addiction and self-destruction. But she’s great in the scenes where Letty takes on different personas to con unsuspecting people out of their money and belongings, and the show is best when Letty turns on her devious charm. It’s less successful at the darker storylines, especially Letty’s relationship with Javier, who’s meant to be both seductive and dangerous, but is mostly just a drag. Letty might actually be a better protagonist for an old-school TNT show, taking on another caper and identity in each episode. Forced into a dark, gritty ongoing storyline, she ends up a chore to watch.