Broken

What's going on?

Loki's P.O.V

I walked, unnoticed through the Avengers floor. In the kitchen Steve and Clint sat, reading the Percy Jackson series. Steve was on the Son of Neptune and Clint was on the Battle of the Labyrinth. I walked into the lounge where Peter, Natasha and Tony sat. Peter was on the Last Olympian, Natasha was on the Lost Hero and Tony was also on the Son of Neptune. Bruce sat in his lab reading The House of Hades. I snickered quietly and froze as I heard a muffled sob. I walked towards the sound and froze as I saw Percy. He walked out of his room and locked his door. He put the key into his jackets pocket.

"Percy?" I asked. He turned to me and my eyes widened in shock. His hair was messier and longer than usual, he was very pale and he had bags under his red rimmed eyes.

"What happened? Are you alright?" I asked softly.

"Nothing. I'm fine." He snapped.

"You know you can tell me if something is wrong." I said soothingly.

"I told you I'm fine. So just-just leave alone!" He shouted and stormed off. I stared in shock at him. I looked at the locked door and had an idea. I placed my hand on the door and concentrated. I heard a click and the door swing open.

"Brother, what are you doing?" Thor asked from behind me.

"Something that might help Percy." I told him.

"Tell me if he comes back." I said and slipped inside. The first thing I noticed was the blood. There was blood all over the floor and his bed. A trail of blood led from his bed to bathroom. I slowly walked forward and noticed something on the ground. I picked it up and studied it. It was a black knife that was covered in blood.
Brother, I think Percy is coming back. We need to go now. He told me in my mind. I quickly pocketed the knife and came out. We quickly locked the door and walked away.

"Did you find something?" Thor asked me.

"There was blood all over his room." I told him. His eyes widened in shock.

"What?!"

"And I found this." I showed him the knife.

"By Odin's beard. Is that what I think it is?" He muttered.

"What? What is it?"

"Look at these symbols. They're actually letters. They mean Tartaraus in Greek."

"Tartaraus? You mean..."

"Yes brother, this is Tartaraus'. I think that he has been torturing Percy."