Heir to the Tribe of the Night Warriors

(Third sequel to Scars) Things go well for Hiccup after the death of Drago Bludvist. But when he meets the heir to the Night Warriors and learns that there might be even more Night Furies he wants to jumps at the chance. However, what can be done when an unknown battle is brought to light and may very well threaten the rebirth of the Night Fury species?