The Big Four

Rise of the Brave Tangled Dragons (+ Frozen) is there an official name for that yet? Anyway, so Jack Frost is trying to not be a guardian, he goes on this quest thing to figure it out, he meets Elsa, Anna finds that Elsa is missing so she goes to find her running into Merida, Hiccup, and Rapunzel along the way. (Merricup, Jelsa) Yeah, my punctuation isn't very good sorry. I suck at descriptions just read it thanks :)

Better description maybe? :
So the guardians are chasing Jack to get him to become a guardian again. Jack is going to the South Pole because no one's powers work there. He winds up in Arendelle on the way there and finds Elsa and the two decide to go to the South Pole together. Anna discovers that her sister is missing and starts to search for her running into Hiccup, Merida, and Rapunzel on the way there. Each chapter is narrated by different characters by first person view.