The Light-field : Book 3 of the 'Triad of Being'

In the battle to get the Being of the Field back to the Universe Parallel, the greatest weapon and risk lay in its own light-field. Ten years in Maladaan's past, Taren Lennox seizes the opportunity to secure personal financing for the AMIE Project and base the building on Frujia - away from Maladaan and its Secret Service. But when the MSS develop a weapon, from a patent of one of Taren's inventions, that counts light - photon by photon - she begins to doubt her ability to keep her ever-growing psychic army a secret. For this new photon-camera can identify a psychic from the more inept by the unmistakable brilliance of their light-field!