The Prisoner (The Dark Elf of Syron, #1‪)‬

Captain Torren, the warden of the Dormigan Prison, knows that the mysterious Prisoner 34 is much more dangerous than the authorities think. Torren does his best to guard him, going so far as to break some of his orders, but the new governor's sudden wish to personally inspect the prison threatens to destroy the shaky balance the warden has achieved. Will the Prisoner comply and help Torren through the inspection? What will he ask in return? And will he keep his word?