They're young, they're in love and they're mass murderers.

"The Thirteenth Step," next week's episode of Criminal Minds, features guest star Adrianne Palicki of Friday Night Lights fame as half of a Bonnie and Clyde-esque duo.

The BAU must hit the road to track down young lovers Sydney (Palicki) and Ray (Jonathan Tucker) and put a stop their interstate murder spree. Should be a wild ride.

Check out TV Fanatic's Criminal Minds review from last night if you missed it, then take your first look at next week's installment via the promo below ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.