Agent Hotchner revisits the first case he worked at the BAU when details come forth that one of the deadliest serial killers in New England's history has struck again after a 10-year hiatus.
A covert identity created for one of Gibbs' undercover cases 20 years ago resurfaces after a murder victim is found living under the alias.
When the 1958 suicide of a celebrated Philadelphian disc jockey is discovered to have actually been a murder, Rush and the team must find the truth of this public persona's private life by decoding a message hidden in his final broadcast.
Rosewood and Villa unravel an illusory case when an escape artist is found dead in a wooden trunk; Hornstock's time with the East Miami PD may be coming to an end; Rosewood gets to know Adrian to see if he's the right guy for Villa.
The team bumps heads with Lt. Lynch when she signs them up for an off-book undercover operation to take down a local gang printing counterfeit money, without giving them enough time to prepare for the mission.