CONTAINS SPOILERS FROM TvGuide (newest):

" . . . but I've seen the penultimate hour of the current "Red John" arc on CBS's The Mentalist
(10/9c), which is quite eventful. With only one episode left until the
actual reveal and face-to-face showdown between the serial-killer fiend
and the vengeful Patrick Jane (Simon Baker),
it's fair to say that the list of suspects is narrowed considerably in
the wake of the explosion at Jane's house. The CBI team is in "do not
trust anyone in law enforcement" mode, as it becomes more clear just how
widespread the "Tiger Tiger" conspiracy is. There's plenty of action,
and another climactic reversal that leaves Jane and us praying for an
end to this ordeal. Unless there's another aggravating football overrun
next week to pre-empt the big reveal, we're all about to get our answer
and some much-needed closure."

So, we need to brace ourselves: things may not appear as they really are, at first!