HTLANF: Race to the Edge

Three years have passed since peace between dragons and Vikings was made. Now Hiccup, Kala, and the gang are reaching adulthood and a life full of adventure. What new enemies will they encounter? What enemies will make a comeback? Why not read to find out? Disclaimer! I do not own HTTYD! That belongs to DreamWorks! I only own the plot and head canons! I also did not draw the cover!