With their victory short-lived and enemies lurking around every corner, odds are stacking against Ren in his attempt to recover the throne of Frayne. Ren, Anik, and a handful of inexperienced soldiers are sent to Fort Endurance, Frayne's highest security prison.Forced to adapt to a harsh environment where only the toughest survive, Ren is unsure how much he can rely on Anik, who's battling demons of his own.When a message arrives signed with the mysterious fox sigil, Ren and Anik are forced to face truths for which neither is prepared.Endurance is the second book in the Iron Breakers trilogy.