The first half of Season 3 was generally a solid first half, with the best episode being "But Not Forgotten" (by some way) and even the lesser ones such as particularly "Pravda" were still decent. Also really like the previous two seasons, particularly the first with a higher number of brilliant episodes and being more consistent, and the first half of Season 3 was nearly if not quite as good. With the previous two seasons getting going a little quicker quality-wise.
"A Murderer Among Us", what a great creepy title, is a very good episode on the whole and a good example as to why the first half of Season 3 works well. It doesn't succeed enough in changing my mind on the chemistry between Goren and Bishop and Bishop herself, and there are one or two hard to ignore logic lapses. Something that is very seldomly complained about by me and usually don't like it, as it does sound nit-picky, but one in particular stuck out like a sore thumb.
Starting with what is not quite so great, there are a couple of logic lapses. Especially with Lena using non-standard Spanish, well actually Ladino, despite not knowing that her parents were Jewish, which would have caused suspicion of her identity quite quickly but wasn't picked up upon that fast.
Bishop is still a little bland and doesn't gel again with Goren as much as Goren did with Eames. Sorry for the comparison but it is hard to when those two made, and did so again when re-united, such a major impression together.
However, "A Murderer Among Us" does contain great acting from Vincent D'Onofrio, dominating effortlessly the entire time he's on screen without being too much of a show off. Also great is Thomas G. Waites, creepy as one of the most loathsome supporting characters of the third season and even of the early seasons. The script is typically taut and intelligent while not taking itself too seriously.
Furthermore, the story may be complicated yet it is never incoherent, and it is also absorbing, tense and continually unpredictable. The ending is quite shocking but also ingenious, with a hair-raising interrogation scene between Goren and Brody that is one of the classic ones of the whole of 'Criminal Intent'. Eames also has two telling scenes, rivalling Goren almost when it comes to how she perceives people. They do betray a bit though how she is a vastly superior character to Bishop.
Summarising, another very well done episode. 8/10