While the Winchesters discover that Lucifer conceived a child while possessing the President, they are left to guard the child's mother while Mary explores the possibility of an alliance with the British Men of Letters. Although Castiel concludes that Lucifer's child is worth protecting, the potential alliance with the Men of Letters ends when the group prove to be excessively ruthless, to the point of killing a hunter who had assisted the Winchesters on a case because she accidentally killed one of their members.