Deviating slightly from the movie and fixing ice castle plot holes.
The triplets ran away from their kingdom and up the north mountain. When they stopped running they were almost at the summit but they stopped to catch their breath.
"What do we do now?" asked Zane quietly
"I guess whatever we want," said Jack. Elsa looked behind them the snow falling lightly around them
"The snow glows white on the mountain tonight, not a footprint to be seen" sang Elsa quietly
"A kingdom of isolation and it looks like you're the queen" sang Jack
"The wind is howling like this swirling storm inside, couldn't keep it in heaven knows we tried" sang Elsa
"Don't let them in don't let them see, be the good kids you always have to be" sang Zane
"Conceal don't feel, Don't let them know" sang Elsa setting a hand on her brother's shoulder
"But now they know" sang Jack, confidence growing inside him
"Let it go, let it go" sang Zane creating small flurries in his hand
"Turn away and slam the door" sang Jack turning on his heel
"I don't care, What they're going to say" sang a confident Zane with triumph
"Let the storm rage on" sang Elsa
"The Cold never bothered us anyway" they sang in unison. Zane ran forward, happiness on his face that his siblings hadn't seen in years
"It's funny how some distance, makes everything seem small, and the fears that once controlled me, can't get to me at all" sang Zane almost laughing
"It's time to see what we can do, to test our limits and break through, no right no wrong no rules for us" sang Elsa
"We're free" sang Jack creating a large ice staircase
"Let it go let it go" sang the triplets running up the staircase
"We are one with the wind and sky" they sang
"Let it go let it go" sang Jack
"You'll never see me cry" sang Zane a large smile on his face.
"Here we stand and here we'll stay" sang Elsa stomping the ground forming the base of a massive castle
"Let the storm rage on" sang Jack helping with the castle Zane was adding the decoration and thrones to the castle smiling more than he had had in years.
"Our powers flurry through the air into the ground" sang Jack
"My soul is spiraling in frozen fractals all around, and one thought crystallizes like an icy blast! We're never going back, the past is in the past" sang Zane the three of them throwing their crowns aside.
"Let it go let it go" sang Elsa beginning to transform her clothes and undoing her hair
"And we'll rise like the break of dawn" sang the three of them their new outfits shimmering in the morning light
"Let it go let it go" sang Jack
"Those perfect kids are gone" sang Zane
"Here we stand and here we'll stay, let the storm rage ooooooonnnnnnnnnnnnnnn!" sang Elsa
"The Cold never bothered us anyway" they sang together before closing the door. They hugged each other totally out of breath and laughing while crying tears of joy at finally being free to be themselves. Elsa noticed the massive change in Zane, his eyes were practically shining with joy and he just couldn't stop smiling.
"Please tell me one of you made beds because I'm exhausted," said Jack
"I did, Thrones, beds, furniture, guards, everything we need I did it," said Zane
"Elsa I noticed you made a snowman, where the heck is it?" asked Jack
"Down the large staircase," said Elsa. Zane led his brother and sister to the massive bedroom and Jack flopped down on the snowy mattress of his new bed. Elsa walked over to the bookshelf which had books where the pages were ultra-thin sheets of snow with letters made of ice.
"Zane how did you do all this there must be at least thirty books here," said Elsa
"There's also a library downstairs, I had a ton of free time over the years and memorized all the books in the castle, it was just a matter of letting my magic do its thing," said Zane
"How did you get the stronger magic?" asked Elsa
"Easy, I'm the oldest," said Zane cheekily
"Only by 2 minutes," said Elsa, they were bickering like little kids again before bursting out in laughter. Zane picked up "The Hunchback of Notre Dame" and started reading.
"Hey I just had a weird idea," said Jack
"What is it this time Mr. Genius," asked Elsa sarcastically
"What if there was a picture frame that you could make the pictures move and talk," said Jack
"That's impossible," said Elsa
"That's what people said about ice powers but hey look at us," said Jack, Zane gave it some thought and waved his hand, on top of the dresser appeared a small icebox with moving figurines in it, acting out a scene from a book. The figures talked in high pitched voices due their size
"Zane that's amazing, now we don't have to make Jack read, he can just watch it" said Elsa
"Yeah, although one thing we don't have here, food, I'm starving," said Jack
"I took care of that, our snow guards are getting food for us as we speak, I kinda wanted venison so I told them to get us some deer," said Zane
"Yeah and how are we going to cook it, ice melts," said Jack
"Luckily I made our kitchen unmeltable," said Zane smugly
"How do you think of everything?' asked Elsa amazed.
"I um kinda have been planning this for a while, running away I mean. I could feel my powers getting stronger every day and it was only a matter of time before I couldn't hold them back anymore so I was getting ready to leave," said Zane
"When were you going to tell us this and did you think about taking us with you?" asked Elsa
"I was going to once all my plans were in place and yes I was going to tell you two but I had to make sure everything was done right, I'm not like Mr. Reckless over here," said Zane jabbing his thumb at his brother
"Hey, that's King Mr. Reckless to you," said Jack
"Oh stop it you two," said Elsa. The three of them then burst into laughter.
"Remember that one year when we were all outside playing in the snow and mom got so mad that Jack took off his shoes and couldn't find them, then we found them totally ruined the next spring," laughed Elsa
"Or the time when we were four and Zane somehow got up into the rafters and dive-bombed the maid carrying the ham." laughed Jack
"I was hungry and she put that sugar glaze I like on it, I got in so much trouble," laughed Zane.