Halt's Peril — John Flanagan

Rangers walk the line between life and death every day, but never before has that line appeared so thin or death felt so certain.

Hot on the trail of the Outsiders -- a cult that's been making its way from kingdom to kingdom, conning the innocent out of their few valuables -- Will and Halt are ambushed by the cult's deadly assassins. Pierced by a poisoned arrow, Will's mentor is near death and in dire need of the one antidote that can save his life. Time is not on Will's side as he journeys day and night through the harsh terrain to Grimsdell Wood in search of the one person with the power to cure Halt: Malkallam the Sorcerer.