Sage

Book 5 of the Age of Jedi Series! Go Read the first 4 books if you haven't!

Description:
Put into hiding, Jade and Obi-wan hear of a group of rebels, after finding more about them, Jade realizes the leader is a Jedi named Caleb who she brought to the Temple when he was little. Even though Obi-wan tries to convince Jade to stay, Jade doesn't listen and seeks out the band of rebels.