Speaker by Traci Chee (Sea of Ink and Gold #2)
Having barely escaped the clutches of the Guard, Sefia and Archer are back on the run, slipping into the safety of the forest to tend to their wounds and plan their next move. Haunted by painful memories, Archer struggles to overcome the trauma of his past with the impressors, whose cruelty plagues him whenever he closes his eyes. But when Sefia and Archer happen upon a crew of impressors in the wilderness, Archer finally finds a way to combat his nightmares: by hunting impressors and freeing the boys they hold captive.