The Enemy Within. Anchorage, #4

Starved and ill, Pelinas finds himself at the gates of Arhanna, the city of his father's enemies. He doesn't recall how he came there, though he remembers vividly his father disowning him. Luckily, the kind-hearted General Devar takes him in. Roya Intalva returns from the Academy up north to take her rightful place in the Ktar's forces only to find that her friend, Romenel, has taken on a new aide whom she does not trust and the troops are succumbing to a mysterious illness.
Intrigue piles upon intrigue and when the walking dead kidnap Duke Semis, it falls to a group of green cadets, a prickly young Lieutenant and the haunted, guilt-ridden Pelinas to ride to the rescue.