Halt’s Peril
by John Flanagan
Book 9 in the Ranger’s Apprentice series (2009)
Will, Halt, and Horace are after a renegade outlaw group known as the Outsiders has journeyed from kingdom to kingdom, conning the innocent out of their few valuables. When Will and Halt, his mentor, are ambushed by the cult’s deadly assassin, Halt is pierced by a poisoned arrow.
Now Will must travel day and night in search of the one person with the power to cure Halt: Malkallam the Sorcerer. But can Malcolm get to Halt in time to save him?