So I get through Castle Cainhurst and take out Martyr Logarius (who is a chump by the way. Why make an optional boss just a big guy with a stick who just begs you to parry him?). I pick up the crown he drops and notice in the item description that it allows the wearer to see illusions and hints that Logarius saw something from his throne. Curious, I put it on and walk to his throne, and it turns out there's a giant hiden room behind it. I go inside and meet the Queen of Cainhurst and join her Vileblood covenant. The church seems kind of suspect anyway, what with housing demon's in the basement and having a bunch of statues of monsters, so I join and swear to be an enemy of the church. Plus, I hadn't found a covenant yet so I was pretty jazzed. There's also a summons to Cainhurst in the room so I grab it.
Now, I know that there's an NPC in the Cathedral area who worked under Logarius, so I put on his dead master's crown and talk to him. I thought we'd fight because I joined the Vilebloods, but he didn't know. I had an option to give him the summons to Cainhurst though, and I assumed that I'd kill him there in front of the Queen to prove my loyalty. I give him the summons and he says he's off to Cainhurst.
I warp to the Queen's chamber and the bastard murdered my Queen! Her guts are all over the room and I picked her flesh off of her chair. I'm pissed as all hell so I attack him and we get into a duel. He's covered in blood and is whacking me with a giant wheel. He probably killed me like 20 times but eventually I got my revenge. Sadly, it didn't bring my Queen back. Off in search of another covenant, I guess...