In New Haven, Connecticut, Trish Davenport has been kidnapped, her long term boyfriend, Jordan, is deceased at the abduction site.
The BAU are called in because of the time sensitivity of the case and because of Trish's father, Evan Davenport.
Evan, a high profile lawyer, has in the past received multiple death threats because of his work, having had FBI protective services for years.
When Trish turned eighteen, she refused the protective service.
The BAU learn that Trish is an identical twin, who has what many would consider a typical twin connection with her sister.
During the initial ransom telephone call, the unsub has an unusual request, which leads to the BAU ultimately figuring out the unsub's motivations.
With this knowledge, Gideon in turn uses an unusual tactic to draw out further information about who the unsub is.
Despite getting some important information about the unsub, Gideon and the team don't like what it infers as it places a major obstacle in their work