The Coven. Guardians of Glede: Next Generation, #2

Pepin reclaims his title as DragonMaster, not fully understanding the ramifications of such a move. Is his allegiance with the elves, or with Mere Odain? The announcement of his decision couldn't have come at a worse time - the Crown Prince is to leave the next day on a diplomatic visit to Dalziel. Once in Dalziel, things rapidly begin to fall apart. Politically, Kyel and Jansson are at each other's throats, Vantann and Thomlin make friends in the wrong places, and Treyas finds out that his SoulMate and squire, Druce Sinclair, suffers from a horribly painful and incurable disease.
To top it off, Treyas discovers that Dalziel has been overrun with Nydiri with the power of Illusion in their grasp. When Vantann, Thomlin and others disappear, Treyas must find a way to free the captives and destroy the Nydiri threat once and for all...