有一条神秘的白色河流，一条能解释过去的河流。但是，它只存在于安娜（Anna）和艾尔莎（Elsa）的母亲为他们唱的一首摇篮曲里。或许这条白色河流真的存在？安娜（Anna）和艾尔莎（Elsa）离开舒适的床去森林里寻找它。也许这条河流可以解释为什么艾尔莎拥有魔法——如果魔法存在的话……

There is a mysterious white river, one that holds the answers to the past. But it's just in a lullaby that Anna and Elsa's mother sings to them. Or is the white river actually real? Anna and Elsa leave the comfort of their bed to look for it in the forest. It could hold the answers to why Elsa has magic--that is, if it exists at all . . .