About the oc

A young girl was taken from berks years ago what happens when she and a dragon attacks berks ship and hiccup and the others have to find her to see if she is friend or foe. Astrid was not a only child she had a sister she did not know about that was taken from berk and they have never found her. What happens if the mysterious dragon rider was found but disappeared just as fast as she was found. What happens when dragon hunters found this rider and tried to take her out of the sky. What if this rider had a whole group to help her and other dragons.