Elsa returned to her castle in Arendelle with Jack Frost in tow. She was excited to introduce her new friend to Anna and Kristoff, but when they arrived, they could not see him at all!
"He's standing right next to me," Elsa said as she waved his hands around him. "He has white hair like me and a shepherd's crook and there's snow on his brown cloak."
Elsa took one of Anna's hands to put on Jack's shoulder, but her sister's hand went right through it. Anna and Kristoff looked both apologetic and embarrassed.
"I-I don't understand," Elsa said as she let go of Anna's hand.
Jack said, "I'm a spirit of winter, remember?"
"I'm sorry, Elsa," Anna said at the same time as Jack.
Suddenly Olaf burst into the small room with a "Hey, everybody! Why are we all looking at Elsa like she's gone crazy?" He stopped in his tracks and gaped at Jack. "Hello teenager-who-looks-like-he-could-be-Elsa's-long-lost-brother, my name's Olaf, I like warm hugs!"
"Whoa, is this one of the snowmen you were telling me about?" Jack said as he squatted down. He poked the top of Olaf's head with his staff, which made the snowman giggle.
"Yes, yes it is!" Elsa said. "But how can he see you?"
"Well, you made me Elsa, and maybe we're sharing the same hallucination. Oh, I have a dent in my head," Olaf said.
"Yeah, there is a dent!" Kristoff said as he kneeled next to Olaf. He turned to where Jack sat and both he and Anna gasped, "You are real!"
Jack jumped up and perched himself on a desk chair. "You can see me too?"
"Yes! And you have ice powers like Elsa?" Anna asked.
"Yes, yes, we've already been through this but yes!"
"Oh that's wonderful! Elsa, I'm so glad," Anna said as she hugged her sister in her excitement.
Kristoff nodded. "Me too, but I wonder if there's any more people with your kind of powers."
"We think there is," Elsa said. "When Jack flew over here—"
"Wait a second, you can fly?" Anna gasped.
Jack folded his arms behind his head and grinned. "Oh yeah, I flew all the way over here with the wind on my back and my staff in hand."
"Unintentionally flew over here if I remember the story right," Elsa added.
"Yes, but I still flew over here, and on the way I saw this giant ice castle floating in the middle of the sea."
"Neither I nor Jack crafted it, so that means there's a third person with ice powers, and we intend to find whoever he or she is and let them know that they are not alone."
"That's a great plan and all," Kristoff said, his arms folded and his brow bent, "but if someone goes and builds a castle in the middle of the ocean, doesn't that mean they want to be alone?"
"Yes, but Elsa did the same thing and look where she is now," Anna piped up as she stood by her sister's side.
"Yeah, but it's a lot easier to go to a castle in the mountains than to a castle in the middle of the sea. Whoever's inside may not want to be found, or might be the person you never want to find. This quest is dangerous in more ways than one, Elsa."
"I know, which is why when I go, Anna, I may be gone for a long time. Maybe forever, I'm not sure."
"Elsa—" Anna whispered, her eyes glittering with held-in tears.
"This is a personal quest. For as long as I can remember I've been wondering where my powers came from."
"You were born with them!"
"Yes, but who else is born with my powers except for myself and a spirit of winter? This isn't superhuman, but supernatural. Maybe when we find this person or persons who lives in the castle on the sea, maybe they will know where our powers have come from and why."
Anna wiped her eyes and said, "I'll keep the kingdom safe for you, Elsa."
They hugged for a long moment. When they parted, they began the plans for the great quest to find the castle. Using a star chart and Jack's faint recollections of the star patterns as he flew over the castle, they made a rough estimation of where to look for the castle. Within a few weeks Elsa, Jack, and Olaf boarded the great wooden ship named Frostlorn and waved good-bye to Anna, Kristoff, and the rest of Arendelle. They set out into the wide, blue-gray sea with the sun high and the wind at their backs.