CBS viewers are in for one happy return next Thursday night, and one scary one.

The Mentalist will air its first new episode in weeks on January 12, as "Always Bet on Red" finds Jane and Lisbon sorting through a very long list of suspects after a high-end divorce lawyer is killed on his speed boat.

These two will also find themselves up against an "old enemy," as the following preview teases. Who could it be? Who do you think?!? Watch and prepare yourself now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.