House on Fire
The BAU team must track down a serial arsonist who instills fear in a small town by setting fire to community meeting places and killing several residents in the process.
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More from this season
S4 E1
Mayhem
When an SUV carrying members of the team explodes, the rest of the team fights to save them and catch the terrorists responsible for the bombing.
S4 E2
The Angel Maker
A series of murders is linked to a serial killer executed a year earlier, and the BAU team must find the link between the dead killer and the new spate of crimes.
S4 E3
Minimal Loss
Reid and Prentiss are taken hostage when they go under cover to investigate possible child abuse at an underground cult.
S4 E4
Paradise
The BAU joins the manhunt to catch a serial killer who conceals the manner of his crimes by staging car accidents.