In eldest, the sequel to Eragon, Murtaugh turns evil and it turns out he is Eragons brother. Remember Angelas' prediction? Eragon trains to be a rider under master Oromis, a dragon rider. Roran and the entire town of carvahall travels to the varden where roran kills the twins who are evil. Murtaugh and his dragon, Thorn beat up Eragon an Saphira in a climactic fight and then they take Za'roc. The Razaac fight Roran and he discovers their weakness and shares it with Eragon.Good book. I hope you enjoy it.