BEVERLY HILLS, Calif. — Move over Lady Mary Crawley. For British actress Michelle Dockery’s next act, the former “Downton Abbey” star is putting on American accents, robbing upscale hotel guests and doing drugs in TNT’s “Good Behavior,” premiering at 9 p.m. Nov. 15.

In the premiere episode, Dockery’s Letty Raines overhears a hitman (Juan Diego Botto) plot to kill a woman. Ultimately, Letty and the hitman become entangled criminally and romantically.

“It’s about two lone wolves who crash into each other,” said “Good Behavior” executive producer Chad Hodge.

Dockery said she fell in love with the character and the story.