Skyfall. The Phoenix Enigma, #5

A training exercise becomes a deadly battle. New dangers and allies in the wild eastern marshes. And a data heist becomes a tense hostage standoff. Jac's medic principles are tested to the limit when a terrifying but controlled training exercise transforms into a desperate fight against invaders. The Resistance is growing into its power as the rangers' training in close teamwork reaches new levels--but in the heart of the city the Avarit regime has new and sinister tactics to unleash that will challenge everything they have learned so far.
The risks are high in this near-future world that has many bizarre twists and yet seems eerily familiar... Skyfall is the fifth book in the Phoenix Enigma series, the near-future dystopian epic from Jay Aspen.