The final legend. That's what To Be A King is. The final legend in the three that Soren, Coryn, the Band, & Otulissa have to read. In this book, they find a world of magic & chaos. Lord Arrin's forces of hagsfiends have split, forming other groups off nachtmagen. Rumors about a group of all hagsfiends led by Lord Arrin's old assassin, Ullryck, have been brought to the attention of the new King Hoole & Grank. They have just recently set up a new order called the Guardians of Ga'Hoole in the enormous tree which has come to be known as the Great Ga'Hoole Tree. There is also another rumor of a mad owl that has taken control of the Ice Palace in the N'yrthghar with his young hagsfiends. Soon, Hoole realizes, the forces of good will clash with the evil forces of nachtmagen. Hoole has the Ember, but to use it could be dangerous. So Hoole must make a choice-use the power of the Ember to restore the Ice Palace to it's former glory, or to let things go on without the strange, mysterious magic that is the Ember of Hoole.
So, along with the Band & Otulissa, Soren & Coryn read the final legend, and see what the future has in store for the Guardians of Ga'Hoole.