Two weeks after the fact, Reid is still reeling over the murder of his girlfriend, Dr. Maeve Donovan, by her stalker. His friends try to reach out to him, but he remains in seclusion, not talking to anyone. They have to figure out a way to bring him back to a state where he at least reaches out for help in dealing with his grief. As such, he doesn't accompany the team on their next case, that of two murders in San Francisco, California, where the two seemingly unrelated victims were found in public places, wrapped in clear plastic and their bodies drained of almost all their blood while they were still alive. Early in their investigation, they find two more victims who have one more similarity: their eyelids were removed. The combination of the eyelids and the body placement of all four victims leads the team to figure out what the unsub is doing with the blood. They still have to figure out why the blood is so important to the unsub to discover who he is before he kills again. Written by
Did You Know?
The team refers to the UnSub's blood type as the universal receiver, AB. This is true for whole blood, but not for plasma, as the UnSub uses. Blood donation centers will sometimes collect only plasma from AB donors, as their plasma does not contain the antibodies that may cross react with recipient blood. For this reason, AB is often considered the "universal donor" for plasma. See more