Why should I

After years of being told that he will never amount to anything and would most likely die before he's 15, he leaves and shows the village how much he was need. Everyone but Astrid thought he died from a dragon attack. In reality Hiccup took off in the night with toothless. Astrid being to only one knowing.

Once a month she would get a letter from Hiccup letting her know he is alive. 5 years have passed and for two months in a row she has not gotten a letter. On the third month of not getting one she runs to the arena and grabs Stormfly which she trained the same day Hiccup left.

When the village saw take off on the back of a dragon they fully realized Hiccup was right.

What happened to Hiccup? Will Astrid find him? How will Stoic feel knowing his son is alive?