[s4e20] Conflicted -

Dr. Spencer Reid eventually realizes Adam has DID.

Adam's female alter, Amanda , emerged during his childhood as a defense against horrific physical abuse by his stepfather. [S4E20] Conflicted

The investigation focuses on a shy hotel employee named and his protective manager, Julie. The investigation focuses on a shy hotel employee

The case deeply affects Dr. Reid, as it reminds him of his own past trauma with Tobias Hankel, another unsub with multiple personalities. The team discovers the dual personality when Adam

The team discovers the dual personality when Adam fails a "control question" on a lie detector that his other personality, Amanda, actually knew the answer to.

The episode concludes with a chilling psychological battle. Amanda eventually takes over Adam's personality completely to shield him from the trauma of the murders.

The episode features a popular quote by Terry Pratchett: "No matter how fast light travels, it finds the darkness has always gotten there first, and is waiting for it" .