Grace and Carlos work together when they suspect a young woman was a victim of a black market organ trafficking ring; Owen's brother Robert comes to visit and meet T.K., but surprises Owen with news that can affect the Strand family.
The BAU searches for a subject who is targeting prominent members of the community.
When two Catorce gang members are shot to death, Brenda and her squad must solve the murders before a gang war erupts. Meanwhile, Brenda has her own personal health scare when she finally visits the doctor.
Abby is encouraged when her unstable mother gives her enlightening advice in a rare moment of clarity; Dr. Weaver ignores Dr. Carter's interest in the chief resident position.
Crew members become stranded aboard a disabled Klingon vessel after they are ambushed by a female Klingon.