The episode is dominated by David Rossi's obsession with (the Chameleon), who nearly killed him in Season 14. Interestingly, the case the team actually investigates in this episode—a killer removing skin from men's torsos—initially appears to be Lynch.
The episode forces the two to confront the awkwardness of that admission. In the second half of the premiere, while JJ is in the hospital after being shot, they decide to remain "best friends" because JJ still loves her husband, Will. Criminal Minds Season 15 - Episode 1
Fans found this episode significant for finally addressing the Season 14 cliffhanger where confessed her love for Spencer Reid . The episode is dominated by David Rossi's obsession