The Company of Glass by Valery Leith
THE COMPANY OF GLASS is the first volume in a three book series that tells the story of Tarquin the Free, a man with no clan, no king, and a past that he would rather deny. But when he learns that his homeland Everien is about to be overrun by his old enemies the Sekk, who command an army almost too large to comprehend, he has no choice but to intervene. He must alert the new King to the danger that awaits even if it means returning to the enchanted city of Jai-Khalar, seat of the weird ancient Knowledge that he renounced nine years ago. The Knowledge that meant he had to abandon his eight companions to die in the Floating Land of Jai-Pendu, that forced him to become an outcast from the land and the people he loved. The Knowledge of Jai-Khalar haunts not only Tarquin, but all the Sekk - an eerie race that appear to be extraordinarily beautiful human beings, but which possess people as demons do. And those the Sekk cannot enslave they murder. But Tarquin is not the only man with a mbitions to defeat the Sekk - the daughter of his late best friend also wishes to rid her people of this omnipresent threat. One of them must succeed - but who will be prepared to take the greater risks, more willing to make the ultimate sacrifice on the altar of the magic of Knowledge.