The BAU travels to Denver, Colorado, where they investigate a series of home invasions that end in the murders of entire families. However, the case takes a turn when they begin to suspect that the killers were once-abused children.
Rossi determines that the case that haunts him has gone unsolved too long on its 20th anniversary, and the team horns in on his investigation despite his displeasure. Elsewhere, Reid and Hotchner interview a manipulative death-row convict.
As a favor to the D.A. in Boston, Hotchner and Rossi profile a woman who murdered her husband, though the D.A. may not like their findings. Back at the office, J.J.'s personalization of a stalker case baffles the rest of the team.
A suspected serial killer who's been in a coma since 2004 due to an accident when he was arrested wakes up 4 years later, with no memory of his past, not even his name. While he is tried in court, in which Hotch is testifying against him, the rest of the team investigates his past further.