Police are called to investigate when a fourth woman disappears in Seattle within four months. Gideon returns to help the team, under the close supervision of Hotch.

Gideon seeks help from a psychologist, hoping to use their professional analysis to track down an arsonist who set fire to a college campus and left very little evidence behind.

As the team tracks a copycat bomber, Gideon learns that the perpetrator is responsible for murdering his previous team.

The BAU visits San Diego to identify a rapist and murderer who preys on women in broad daylight in wealthy neighbourhoods.

The BAU is quick to realise that the kidnapper of a US district attorney's daughter abducted the wrong twin.

The BAU must identify a sniper preying on victims in broad daylight, and attempt to recreate a shooting.