This is a great example of the series focus. In the Mix: 1. The Serial Killer (Its sometimes nice to have the Unsub pre-defined and BAU criteria met; Still, sometimes its not). This particular episode is at the core of the series plot, and an excellent choice for an unsub with pre-defined BAU criteria. 2. The Behavioral analysis. The unsub is still at large, and a development of plot as the team rushes to put together a profile to hunt down the Serial Killer. Classic series structure.
3. Missing/abducted type-specific victims. 4. The twist: A child caught in the middle; Used as bait, and the victim of his own father. Yet again the team work together despite opinions vs scientific methodology pinning the characters seemingly against one another. The usual banter is there; But it is refreshing and always character developing.
* Keep these coming CBS. (Pssst. these are best viewed in 720p...) ;)