The Blacklist Exclusive Sneak Peek: Who's Threatening Liz?

After a diorama depicting a gruesome murder gets delivered to Liz's doorstep, she assumes it was sent by someone she worked with while she was head of the FBI's mobile emergency psych unit, who wants to taunt her.

[...] Red Reddington (James Spader) has a different theory about who the culprit might be, and in the exclusive clip above, he warns Liz: "Do not take this lightly."