Author: Flanagan, John
Interest age: from c 9 years 
Published 01/09/2011 by Penguin Random House Children's UK (Yearling (imprint of Random House Children's Books) in the United States as part of the Ranger's Apprentice series 
Paperback | 464 pages
Halt's Peril is the ninth thrilling book in John Flanagan’s Ranger’s Apprentice series – over eight million sold worldwide.
The renegade outlaw group known as the Outsiders has journeyed from kingdom to kingdom, conning the innocent out of their few valuables. Will and Halt, his mentor, are ambushed by the cult's deadly assassins when 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.
Perfect for fans of J.R.R. Tolkien’s Lord of the Rings, T.H. White’s The Sword in the Stone, Christopher Paolini’s Eragon series and Rick Riordan’s Percy Jackson series.