Angels of Death S01E12 - Try to know everything about Her.
Summary:
Floor B1 looks like an ordinary residence. After following a trail of blood to what appears to be a living room, Rachel suddenly panics. She pressures Zack to kill her immediately, then passes out. Then Danny appears, only to shut Zack out of the room and tell him, "If you succeed in learning everything, I'll open the door." So Zack sets off to search the floor on his own for the truth...
As Zack proceeds deeper into the floor, Rachel witnesses more
items that trigger her memories, and she faints. Danny then
arrives and locks Zack out of the room Rachel is in, offering to
unlock it only when Zack fully explores the floor and finds out
Rachel's past. Zack reluctantly begins exploring the rest of the
floor, fighting his way through various traps until he is met by
Gray. Gray reveals that he controls the entire the building, and
uses it as a way to study and observe people who believe in God
with Rachel as his current subject. In order to test them, he
put his "Angels" Danny, Eddie, Cathy, and Zack himself on each
floor. Gray then reveals that he's become interested in Zack and
Rachel's relationship, and provides Zack with a clue on how to
proceed. Meanwhile, Rachel wakes up and is shocked to see Zack
investigating the floor. Zack enters what is revealed to be
Rachel's room, where he views a recorded news report saying that
Rachel's parents were murdered while she was found at the scene
unharmed, implying Rachel murdered her own parents