We have the synopsis for Supernatural season14 episode 15.
 
SUPERNATURAL
“Peace of Mind”— (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
PLEASANTVLLE – Sam (Jared Padalecki) and Castiel (Misha Collins) follow a case to a picturesque little town in Arkansas, only to find out nothing is as idyllic as it appears to be. Dean (Jensen Ackles) and Jack (Alexander Calvert) take a road trip to visit an old friend. The episode was directed by Phil Sgriccia and written by Meghan Fitzmartin and Steve Yockey with teleplay by Meghan Fitzmartin. (#1416). Original Airdate 3/14/2019.

Source:

The CW

 
So Sam and Cas are teaming up this week. What do you think they will find in the picturesque town? In another pairing, Dean and Jack work together. What old friend do you think they are looking for? Let us know in the comments or in the discussion thread for episode 15