Sorry for writing this so late. I was swamped by all the shows last night and couldn't get to The Mentalist until now.
"Red Hot" features the return of Walter Mashburn, the rich guy from the season two episode "Redline." The plot goes as expected with Mashburn targeted and the CBI protecting him until Jane catches the criminals. The large majority of the episode is Mashburn flirting with Lisbon and Lisbon sort of liking it.
That final scene probably came as a surprise to most people, including me. Lisbon keeps things under tight control and we rarely see her stray out of purely professional behavior. Her one-night stand with Mashburn sure puts a spin on things, and that cross was in plain sight for everyone to see. I'm not thrilled with this portrayal, but we'll what happens next.
Score: 8.5/10