"Can't catch me!" five-year-old Princess Anna of Arendelle cried as she raced through the halls of the palace.

"Oh really?" eight-year-old Princess Elsa replied with a smirk as she chased her little sister. "Well, I guess we'll see about that, now won't we?"

A pile of white appeared in front of Anna, and before she could stop herself, the young princess ran straight into the snow. "I should have known," Anna mumbled into the cold powder.

Elsa gleefully walked up and tapped her sister on the shoulder. "Tag, you're it."

Anna stood up and spun around. "No fair!" she protested. "You cheated!" She crossed her arms and glared, doing her best to look angry.

"Did not!"

"Did too!"

Elsa suddenly stopped and burst out laughing. Anna joined in a second later, as the two sisters could never stay angry at each other for long.

"I'm sorry, Anna, I won't do it again," Elsa promised.

"Promise?" Anna asked suspiciously.

"Well…"

"ELSA!"

"Alright, alright, I promise," Elsa responded with a laugh. "Until next week," she added with a small smirk.

Anna was about to protest but thought better of it. Besides, crashing into the snow had been fun, and it somehow seemed wrong to make Elsa not do something that was a part of her. "Fine," she agreed.

"Hey, I have an idea," Elsa spoke up, leaning down to whisper in Anna's ear. "See that door right there?" She motioned to a white door to the left of the sisters and Anna nodded. "Well, how about we go hide in that room, and scare the next servant that goes in?"

Instantly, Anna's eyes lit up and she grinned mischievously. The sisters looked around to make sure no one was watching them before quietly going into the room and closing the door behind them. It was pitch black inside, so Elsa used her powers as a small glow to see by so she could find the window. Finally, she found what she was looking for, pulled open the curtains, and light instantly filled the room. From their surroundings, the girls could tell that they were in a storage room of sorts, and it was very, very dusting and full of old boxes.

"Hey, Elsa, I don't think I've been in here before," Anna commented.

"Me neither Anna, but…" Elsa trailed off as she noticed a tall item in the corner that was covered by a large, white sheet. "Wait a minute, what's that?"

The princesses walked over to inspect the item. "I don't know," Anna replied, "but let's find out!"

"Anna! Wait, I don't think we should-" But before Elsa could finish her sentence, Anna had whipped off the cloth and the girls found themselves standing in front of a mirror. It was rather large, and Elsa estimated it was probably a little taller than her father. The glass was surrounded by a very detailed frame. Carved into the wood were several spirals, crocuses matching Arendelle's symbol, and little snowflakes. At the bottom of the mirror, just below the glass, was a small inscription. Elsa and Anna bent down to examine the symbols, and after a moment, Elsa recognized them to be Old Norse runes, although she couldn't read them.

Mesmerized, the oldest princess slowly reached forward and traced the symbols gently with her fingers. "Wow," she breathed. "These are-" She was interrupted by a bright flash of light from the mirror, so bright that the girls scrambled backward as quickly as they could and covered their eyes. The light dimmed after a second, but before the sisters could lower their arms, the flash came again. This repeated until the light had come and vanished a total of four times.

Finally, the girls slowly uncovered their eyes. What they saw shocked them so badly that they could only stare with their mouths hanging open.

Meanwhile, in a time ten years in the future…

Eighteen-year-old Elsa paced back and forth inside her room. "Stop it!" she whispered urgently to herself. "Control it! You are in charge, not the other way around. Your powers do not control you, you control them."

Just then, an all too familiar sound reached her ears. Knock-knock-kno-knock-knock. "Hey, Elsa? I know what your answer's going to be, and honestly, I'm not even sure why I'm asking, but do you want to come do something with me? We can go to the stables, take a walk around the garden, go sock-sliding, slide down the banisters, or I could even introduce you to Joan!"

Elsa was about to ask who Joan was, but then she remember her sister's hobby of talking to paintings. "The answer is yes," she whispered. "I would love to do those things with you, but I can't." Elsa sighed longingly. "Not now. Go away, Anna," she replied in a louder, stern voice.

"See?" Anna shot back. "This is why I don't understand why I'm dumb enough to even open my mouth. Bye, I guess." Elsa heard Anna's footsteps fade down the hallway.

After a second, the crown princess resumed what she had been in the middle of. And that was trying to thaw her room, which was covered in ice. "It's only one more week," she reminded herself. "One more week to hold out and they'll be back." As usual, her thoughts of 'Conceal, don't feel' didn't get rid of the frost. "Oh, Mama, Papa," Elsa whispered. "Why did you have to leave? If you were here, you could probably help me. Oh never mind, that's just hopeless wishful thinking. Nothing anyone could ever do can solve this problem; this curse."

Suddenly, a bright flash surrounded her, and her bedroom vanished.

Meanwhile, three more years in the future…

"So, Anna," Kristoff spoke up, "tell me more about your sister." The ice harvester was still rubbing his nose protectively after almost getting impaled by an icicle. He stared ahead at Olaf and found that the little snowman was doing what he had done since they had started walking together, and that was zig-zagging back and forth across the path while taking in all the snowy, cold scenery.

"Well, she's really nice," Anna replied, "and she always acts nervous. Oh, and she likes to hide in her room. Beyond that, I don't know her well enough to describe her better, since she's locked herself away from me for thirteen years. But I do know one thing, she's the best sister I could ask for. By the way, I'm hungry. Can we stop for lunch? Do you eve have anything for lunch?"

Kristoff shrugged. "Carrots, and that's it."

"Well, it's better than nothing. Let's go sit down over here to eat." Anna led the way off the path and into a snowy clearing before plopping down on the cold ground. She looked up at her fellow traveler expectantly.

Kristoff sighed, rolled his eyes, and pulled a carrot out of his bag before handing it to the princess. He pulled out another carrot, gave Sven a bite, and then bit off a piece himself. "What exactly are you planning to say to her once you find her?" he asked as he and Sven continued nibbling on the orange vegetable.

Anna scrunched up her face in disgust at the slobber dripping off of the carrot. Then her face twisted into a thoughtful expression. "I'm actually not sure, but I'll cross that bridge when and if we find Elsa." After a few seconds, Anna stood up, a troubled look on her face. "Actually, can you excuse me for a moment? I need to figure that bit out." She walked several feet away before pacing back and forth as she tried to come up with a plan.

Kristoff shrugged, grabbed another carrot out of his bag to share with his reindeer, and turned his back to Anna. He didn't notice the bright flash of light, or the fact that the princess had disappeared.

Meanwhile, at the top of the North Mountain…

Queen Elsa stood on her balcony, gazing out at the surrounding mountains. She couldn't believe the freedom she finally felt. She was the happiest she had been in years. But, as always, something came along to dampen her spirits. "Anna would love this," she thought. And of course that brought up memories of the accident, the last thirteen years, and the coronation the day before. Elsa sighed and slowly walked back inside her palace. "Why can't anything ever be simple? The moment I'm free and happy, I think of the past and everything goes downhill." She laughed quietly. "How ironic. I told myself that the past is in the past, yet I still can't seem to forget it! I almost wish I could be as forgetful as Anna sometimes."

Elsa gasped as the word 'forgetful' brought up even more memories. These memories were of an ancient troll wiping all remembrance of magic from little Anna's head. Elsa sat down against an icy wall and curled up into a ball. She barely noticed as a white flash of light surrounded her.

Meanwhile, one more year later…

"Anna, will you please stop?" twenty-two-year-old Elsa pleaded as her sister insisted on forcing spoonful after spoonful of soup into her mouth. "I'm fine, and I can take care of myse-AHOO!" Several snowgies popped up and started running around the room.

Anna smirked. "I'm not so sure about that. Now stop fighting me and let me get this into your mouth."

Elsa obediently opened her mouth, and the now nineteen-year-old princess shoved a metal spoon full of hot soup in. "Anna, I have to get back to work. I rested most of the afternoon yesterday after your party. I'm pretty sure I'm fine now. ACHOO!"

Anna's smirk grew more intense as she watched the growing herd of snowgies chase each other. "You're still sneezing. Therefore, you're still sick."

Elsa gently pushed her younger sister aside, stood up, and walked over to her desk. "Anna, I promise you that I'm fine," she said as she started to pull her chair out. "Besides, just because you sneeze doesn't mean you're sick. In fact, a lot of things can cause one to-ACHOO!" she was interrupted by her sneeze, followed by a bright flash of light which caused both girls to squeeze their eyes tight.

A moment later, the light went away, and the sisters stumbled forward slightly before opening their eyes. Anna almost screamed at what she saw, but Elsa clamped a hand over her mouth before she could. A few feet in front of the sisters, with shocked expressions matching their own, sat younger versions of themselves.