Chapter One: Away From Home

Growing Up Haddock Story 6: After a trip to a foreign tribe, a deadly disease begins spreading around Berk at an alarming rate and it's up to Hiccup and his daughter to find the cure before people start dying. Meanwhile, Astrid remains home to act as chief but soon falls victim to the disease, leaving her son a lot more responsibility. Only HTTYD and Riders/Defenders of Berk are canon.