For those that, like myself, are binge-watching Criminal Minds after having only previously caught the odd episode on the TV: this is the episode that you most likely vaguely remember, and that you really ought to watch again. There are only a couple dozen or so 'memorable' Criminal Minds episodes out there and this is certainly one of them!
The plot is incredibly engaging; though initially (and overall, to some degree) not one of the most original concepts for an episode, the plot is well-developed and the resolution seems just. Though season 6 and 7 are rife with forced-dramatisation and oddly placed emotional appeals, the development of this particular episode allows it to stand alone, but not as the typical 'Baddy of the Week' that we've come to expect. Instead, it is supported by its own merit: it is a good episode with great development, characters that are human, and above all it is worth the 44 minutes!
There is also an overall advancement in Reid's character, and development of the team as a whole, which is always something great to look out for in this series.