The Sword of Shannara
It is the first book of the "Original Shannara Trilogy" , followed by "The Elfstones of Shannara" and "The Wishsong of Shannara" . 
<triplet> Original Shannara Trilogy <subj> The Elfstones of Shannara <obj> has part <subj> The Wishsong of Shannara <obj> has part <triplet> The Elfstones of Shannara <subj> Original Shannara Trilogy <obj> part of the series <triplet> The Wishsong of Shannara <subj> Original Shannara Trilogy <obj> part of the series