The Icebound Land (Ranger's Apprentice, Bk. 3)

Kidnapped and taken to a frozen land after the fierce battle with Lord Morgarath, Will and Evanlyn are bound for Skandia as captives aboard a fearsome wolfship. Halt has sworn to rescue his young apprentice, and he will do anything to keep his promise - even defy his King. Expelled from the Rangers he has served so loyally, Halt is joined by Will’s friend Horace as he travels toward Skandia. On their way, they are challenged again and again by freelance knights - but Horace knows a thing or two about combat.