My overall rating of "The mentalist"'s Season 5: 4/10.
There are some things about this episode that are quite interesting: I liked the characters - the husband and wife inheritors were especially cool; I liked how chock-full with valid suspects the episode was; and the initial idea for the setting seemed interesting enough - if maybe a bit of a re-tread of "Red Scare" (with even lamer dialogues). However, the idea didn't ever take shape quite fully and the writing was some of the worst imaginable: oh, the contrivances! Oh the plotholes! Just think how much of this episode is our hapless detectives rubberbanding between locations to ask one question each that they should've known the answer to within an hour of starting the investigation! Even detectives from Agatha Christie's novels, set in the first half of the XXth century, would've said: "Sod it, we'll call, we're not driving through California traffic for this one random question!"
But I did correctly guess whodunnit halfways through, and, well... It makes no sense, but it is fun, I guess, which unfortunately describes too much of "The mentalist".