Tom Hollander has been listed in the credits for both episodes, but I don't think I've seen him. Have I seen him and just not recognized him? His character's name is "Quentin."
I noticed it in the scene where she appeared to be worshipping at the shrine. I couldn't make out a name, but there appeared to be a hospital-type bracelet with a 1944 birthdate. So maybe her mother?
I'm rewatching and just noticed something in Episode 3. When Cobel is snooping in Mark's basement, and she picks up the Christmas candle and smells it, she says, "No." Why?