The BAU team investigates a mass murder at an Internet security company in Charlottesville, Va., but clues reveal it is not a typical serial killer at work.

A series of murders in San Francisco bearing the tell-tale signs of the infamous Zodiac Killer have the BAU wondering if the notorious serial killer has returned. Also, Reid ponders if he should be doing more with his genius abilities.

The BAU team heads to Oregon to investigate a series of gothic, ritualistic murders.

An UNSUB who kidnaps families with the intention of making them admit to and pay for their indiscretions.

An attendee at a popular motivational-speaker's conference in Seattle is murdered and the speaker himself disappears soon afterward. Meanwhile, Garcia is puzzled when Morgan refuses to attend a dinner honoring an old family friend.

The BAU travel to Rapid City after two male victims are discovered murdered in a ritualistic manner. Also, Reid continues to grieve over Maeve’s death.

When a sniper strikes Dallas, the BAU investigates whether the upcoming anniversary of the Kennedy assassination is a motivating factor or if something else is driving the unsub.

When a young boy goes missing from his home in St. Louis, the BAU reinvestigates a similar cold case to search for the UnSub.

The BAU must determine the true cause and motive when several drowned people are discovered in the Las Vegas desert.

When a passenger jet crashes in Colorado, the BAU team is called to build a profile around the suspicious circumstances. The case hits close to home for Kate, who is reminded of a family tragedy.

When the BAU is called to Salt Lake City Utah to investigate a triple homicide, the search for a connection among the victims could lead them to a fugitive who could have ties to the UnSub.

When the wife of an up-and-coming congressman disappears, the BAU investigates his political enemies as possible suspects.

When a Los Angeles bus is attacked with sarin gas, the BAU must act quickly to find the suspect before a larger-scale incident occurs.

After two undercover DEA agents are murdered and a third goes missing, the BAU joins the NSA to investigate whether an underground Internet drug syndicate is involved. Also, Hotch hopes the team’s work with the NSA brings them closer to finding the “Dirty Dozen” hitmen ring.

When guards at a Virginia prison intercept a package with evidence relating to the kidnapping of two boys several years ago, the BAU questions a notorious serial killer who may have information on the boys’ whereabouts.