Summer Hearts and Haunts - Modern Hiccstrid...
Hiccup, Astrid, Elsa, and Jack are in a band called Frosted Dragons and their summer plans get ruined because they have to go to Camp Elements. There is something strange going on at Camp and they are determined to make it out of the camp alive. The legend of the werewolf that haunts the town and camp might just be real.
Disclaimer: I don't own anything except for the story plot and the band and camp names.