Thank you all so much in your support with this story. I hope you enjoy this next chapter.

Harry stared at the two of them. The man who killed his parents and the girl who had been helping him. It was so strange she could have been his twin. Maybe Black had made her look like him for some sick twisted reason.

"Expelliarmus." Sirius pointed his wand at them. Their wands soared through the air and he caught them. "I thought you'd come and save your friend." Black said to him. "It's what your dad would have done for me. Very brave of you not to run and get a teacher. It'll certainly make everything much easier."

Hazel wanted nothing more than to run for her brother but she held back. After all Harry thought he was in the room with their parent's killer and he had no idea who she was at all.

Harry made to charge them but his friends held him back.

"No Harry." The girl whimpered.

Ron however looked right at Black. "If you want to kill Harry, you're going to have to kill all three of us." He told him.

Sirius shook his head. "No, there'll only be one murder tonight."

"Why?" Harry snarled. "Didn't care twelve years ago when you killed all those muggles. When you slaughtered Peter Pettigrew. What? Gone soft in Azkaban?"

The girl whimpered. "Harry. Please, be quiet."

"HE KILLED MY MUM AND DAD!" Harry exclaimed and broke free from his friends and charged at Black, tackling him to the ground.

In complete shock, Black didn't get to the wands in time and Hazel was knocked aside as Harry tackled him. Before Hazel could grab the dropped wands, the girl charged up and grabbed them.

"No." Sirius pinned Harry, his hand around Harry's throat. "I've waited too long."

The girl tossed Ron his wand, he leapt from the bed onto Sirius's wand arm and at the same time he pointed his wand at Hazel while Hermione kicked Sirius in the head. "Don't move." Ron barked at the girl.

Hazel looked at him and held up her hands. "You don't know what you're doing." She shook her head.

"Oh yeah? What spell has he got you under? The Imperius."

Hazel shook her head. "I'm not under a spell."

Harry meanwhile made for his wand but Crookshanks jumped at him and was now going for Harry's wand. "Oh no you don't." Harry bellowed and ran for his wand. He snatched it off the ground, kicking at Crookshanks, who leapt out of the way, hissing at him. "Get out of the way." He ordered Ron and Hermione.

Sirius looked up as Harry pointed his wand at his chest. Slowly he pulled himself up to stand. "Are you going to kill me Harry?" Sirius asked. "I wouldn't blame you."

"No." Hazel exclaimed and jumped in between Sirius and Harry. "No, Harry please. You need to listen to us."

"Move." Harry barked. "I don't care about you. I just want him."

Hazel shook her head. "Please, hear us out."

"Move or I'll kill you too." Harry snarled at her. "You don't know what he's done."

"I know what you think he's done." Hazel shot back.

Sirius put his hand on Hazel's shoulder. "Hazel, get out of the way."

"No." Hazel said stubbornly. "I will not move." She had tears in her eyes now. "Don't you want to know the truth Harry? Don't you want to know why we look like each other?"

"Some kind of spell to throw me off." Harry shrugged. "It won't work."

Hazel shook her head. "It's not a spell."

Before she could say anything else there was sound of movement underneath them. Someone else was in the Shrieking Shack.

"HELP!" The girl exclaimed. "HELP! WE'RE UP HERE! SIRIUS BLACK! QUICK!"

A few seconds passed and the door burst open in a shower of red sparks. In the doorway appeared Professor Lupin who looked around the room at everyone before pointing his wand and saying; "Expelliarmus."

Harry's wand flew out of his hand and Lupin caught it. He crossed the room over to Sirius and looked him in the eye. "Where is he, Sirius?"

Slowly Sirius raised his hand and pointed at Ron. To everyone else in the room this was the strangest thing Black had done.

Lupin frowned. "Then why… Oh you switched… Without telling me?"

Sirius nodded.

Lupin looked at Hazel. "And I'm guessing, your parents had you while they were in hiding meaning your birth was never registered."

Hazel nodded.

Harry frowned. "What are you talking about? Professor Lupin, what is…" He didn't finish his sentence because Professor Lupin had stepped forward and embraced Black like he was a brother.

"I don't believe it!" The girl exclaimed. "You… You and HIM!"

Professor Lupin held up his hands. "Hermione…"

Hermione shook her head. "I didn't tell anyone." She exclaimed. "I… I even covered up for you." She looked like she might cry.

"Hermione please…" Lupin pleaded. "I can explain."

"I trusted you." Harry barked at him. "And all this time. You've been his friend."

Lupin shook his head. "No. Harry. Sirius and I haven't been friends for twelve years but I am his friend now and I need you to listen…"

Hermione cut him off. "Don't trust him Harry. He's been helping Black and that girl get into the castle. And… And he's a werewolf."

"I have a name." Hazel huffed. "And you're wrong. I've never met this man before in my life." She glanced around.

"Like we'd trust you?" Harry snarled.

Hazel shrugged. "You really should."

"Why? Because you've done something so you look like me? I mean it's close but you got the eyes wrong. My eyes are green." Harry sneered at her.

"You are wrong Hermione. I haven't been helping Sirius or…" Lupin looked at Hazel.

"Hazel."

"Hazel into the castle. But I am a werewolf." Lupin sighed. "How long have you known?" He asked Hermione curiously.

Hermione looked at him defiantly. "Since Professor Snape set us the werewolf essay."

Lupin chuckled. "He was hoping someone would pick up on it. I have to say Hermione, you really are the brightest witch of your age." He told her.

"I'm not." Hermione told him. "If I were, I'd have told everyone what you really were."

Sirius sunk onto the four poster bed and covered his face with a shaking hand. Hazel sat down next to him, Crookshanks jumped up onto her lap like he was protecting them.

Lupin shook his head. "But they do know. Well the staff do anyway."

"Dumbledore hired you when he knew you were a werewolf? Is he mad?" Ron exclaimed.

Harry growled. "And he was wrong to trust you. Because you have been helping them into the castle all year." He exclaimed.

"He hasn't." Hazel rolled her eyes. "We've told you a thousand times. Will you just listen. God and they say I'm stubborn." She huffed.

Harry glared at her. "And what is that supposed to mean?"

Hazel glared right back. "Work it out. I look like you. I'm roughly a year younger than you. I'm here for a reason. What could it be? Who am I?"

"I don't know." Harry snarled. "How am I supposed to know that?"

"Harry." Hermione said quietly. "I think… I think you're related."

Hazel looked at her. "Well at least you have a brain."

Harry frowned. "Related?"

Hazel nodded. "Hello Harry Potter. I'm Hazel Potter. I'm your sister."

Dun, dun, dun. So Harry knows now. What will his reaction be? Find out in the next chapter :D