You quickly dialed your girlfriend's phone, Annabeth, she was at the arena while you were your cabin, crying hysterically. "ANNABETH! Please... please come back! There's something here! I don't know what it is!" I sobbed into the phone. See, your brother isn't a Half-Blood of Hades like you, you were the only daughter. So your brother isn't able to get in, but ever since last night.. things changed. What happened last night? Well, someone was knocking on your cabin door, so you opened it. No one there. And ever since then, you hear screams in your cabin, but tonight? Things crossed the line. You were sleeping while Annabeth was helping Chiron in the arena but.. your door handle form the bathrooms kept jiggling, like someone was trying to get in. You heard something mimick your brothers voice. "Please, let me in! Help me!" The voice would shout until you opened your bathrooms door, now crying. No one was in there. And that's when you dialed Annabeth while frantically searching around your cabin. When you went outside and looked out there around your cabin, you saw a pure white figure in the bedroom, but when you bursted in.. it was gone. Disappeared. "PLEASE ANNABETH! I can't.. I.. oh my god.." you said, still crying

Don't open doors when you don't know who's there...