Alliances, friendships and faith are all tested as the 5th Squadron come face to face with the perils of The Source. In their relentless search for a missing member, the squadron encounters a place outside of their collective understanding that is considerably more than it seems! However, there is one being who might help, but finding him means avoiding the giant creatures, the Elementals! But the Elementals are are everywhere - in the air, under the ground, in the water - and not even Britain's elite flying team and Germany's top ace can imagine the consequences of getting home!