Saphira's enemy

A man of the age fourteen arrives in Teirm on the ship called "The Basilisk" why he is here is not know. So why is he interested in Eragon and Saphira? (rated T for parts to come. Also this is a story where I want your help writing it send me an idea I post a chapter before I start writing the next so give me your idea and I might put it in here. Also please don't copy this story.)