Disclaimer: Come on if you don't know it, I ain't repeating it okay.
The source of the Mcormack's power lay in a gold pendant. With the pendant they could force people to do things against their will, including commit murder or suicide. Which explained all the deaths over the years. However, without the pendant they were powerless. Mrs. Mcormack had foolishly dropped it after the death of the Pevensie's great-uncle where it had fallen through the cracks of the floorboards in the attic.
The children did not know about the pendant and, in fact, had walked over it several times the day they were up in the attic. It wasn't until they were exploring the house again, that Lucy caught a glimpse of something gold shining through the crack of the floorboards, where the sun hit it directly. She knelt down and managed to pry the thing up. Holding it in her fist, she felt slightly strange as if she had more power than she knew what to do with.
Her eyes took on a blank unfocused look and her breath quickened. Susan was the first to notice her.
"Lu, what's wrong?" She reached out to her sister.
"Don't touch me!" Lucy screamed, not sounding at all like her sweet self. In fact, she sounded animalistic with her eyes wild and she stood up tossing her hair and laughing uncontrollably.
Peter, Susan and Edmund watched as Lucy tore down the attic stairs.
By the time the three of them made it downstairs, the parlor was destroyed.
"Where is she?" Edmund asked.
They heard a crash from the ballroom and rushing in, they found Lucy holding a jeweled dagger. Where she had gotten it from, they didn't know.
Susan was about to rush forward when Peter stopped her.
"Don't go near her!" He ordered. There was something about her eyes that made Peter believe his sister was in there somewhere.
"You and Ed just go. I think I can talk to her. Just go, she isn't herself!" Peter urged.
Peter waited until they were safely out of the room before turned to Lucy.
Peter inched forward, not taking his eyes off Lucy's eyes. He had seen the pendant around her neck and knew this was causing the change in her.
"Get away from me!" Lucy screamed raising the knife. "I'll do it! I will! I will!"
"Lucy, look at me!" Peter commanded.
Lucy looked at him, then cocked her head and in a voice that sounded about four giggled and said, "Lucy's not here! I'll take a message. Wanna come out and play with me? They said, I'd get playmates. Lucy's my playmate. She does whatever I tell her to. Everyone does whatever I tell them to. I have a lot of playmates all ages!"
Peter stared at her. "What do you mean you have a lot of playmates?"
"Lucy" giggled again. "Do you wanna be my friend? We can have tea parties!"
"No!" Peter reached out and grabbed the pendant. "Lucy" screamed in rage and bit him, and he realized for some reason she was stronger than normal. Even so, Peter was stronger and he managed to pull the pendant off of her. He smashed it on the ground.
"Peter?" It was Lucy's voice, now sounding confused and lost.
Peter swept her in his arms, and Lucy started crying. "I'm sorry!" She sobbed over and over. "I didn't mean to!"
Suddenly the house started to shake. Peter pulled Lucy up and they started for the door, but it slammed shut.
All the windows that had been opened slammed shut.
"Hasn't anyone told you not to touch things that don't belong to you?" Mrs. Mcormack asked, appearing as if by magic.
Peter pushed Lucy behind him. Mrs. Mcormack laughed evilly and with a sweep of her hand threw Peter across the room. He hit the far wall and crumbled to the floor.
A scarf appeared and wrapped around Lucy's throat, lifting her up inch by inch. She gasped for air, clawing at the scarf, her eyes wild with fear.
Mrs.Mcormack threw her head back and laughed and laughed. "Shall I kill you now and have your brother watch the life drain from your poor little body?" she taunted.
On the other side of the door, Susan and Edmund were trying to get in, with no success.
"A secret passage!" Edmund cried, grabbing Susan's hand and pulling her toward the library.
"Why are we in here?" Susan asked, watching Edmund toss books out from the bookcase and onto the floor.
"In stories, there's usually a secret passage hidden in the library leading to different rooms in the house." Edmund explained.
"Oh, I see!" Susan said, as she started pulling books off the shelf.
"Here!" Edmund called, pulling a book halfway off the shelf. The bookcase opened to reveal an opening.
Susan grabbed a torch and spool of thread. "So we don't get lost." She explained to Edmund when he looked at her questioningly.
Peter opened his eyes to see Lucy being strangled by a silken scarf. He tried to move, but found he couldn't. He could only watch helplessly as the scarf squeezed tighter around his sister's throat.
Mrs. Mcormack stood there laughing.
A/N : Ah the dreaded cliff hanger what will happen ?