Author's notes: Hi everyone, this is my Dark Knight story. When I first saw the film, I was fascinated by the Joker, so I decided to write this story. I'll update as regularly as possible, but only if I get good reviews, so if you like it, please tell me so! This is about the Joker's cousin, who is a criminal herself and decides to help him out. It's set after the movie, so contains a few spoilers. Anyway, this is just the intro, Chapter 1 is where the story really starts - but please don't skip this, as it's some important background info.

Disclaimer: I don't own The Dark Knight or its characters. I only own Mercury.

Introduction

The little girl giggled in delight as she ran through the huge garden, every now and then letting out happy squeals as her cousin neared her. Her platinum blonde pigtails bouncing up and down with every step she took, she eventually came to the old oak at the bottom of the garden. She stopped, panting heavily. Her cousin neared her, excitement in his dark eyes.

"Giving up already?" he taunted, he too out of breath.

"No," she sighed. "Just having a break. I'm too tired to run anymore."

"You're so boring," he moaned.

"Shut up, Jack," she said sharply.

He glared at her, using the glare that most people found uncomfortable. Even his own parents would flinch in horror when they saw it, but Mercury simply glared back with her own steely grey eyes. He eventually gave up – she had won the staring competition, as usual.

"Why do you always win?" he complained.

"Because I'm older, stronger, cleverer and better than you," she replied, moving away from the tree. "I'm going inside, I want a drink."

She left him, his head hung shamefully in defeat. Somehow, Mercury always managed to put him down, always managed to hurt his feelings. From that moment on, Jack decided that he hated his cousin, and anyone else for that matter.