The Eye of Venus

This book 'The Eye of Venus' is Book One of a trilogy. The other books are entitled 'Twenty Years On' and 'The Return to Chiaros'. This series set hundreds of years ahead from now and on another planet is what I call (soft) Sci-Fi/Fantasy. Science and history are background to the story. The story is of a quest for an emerald a special emerald. The emerald is part of a device that was used for inter-realm passage.The main competitors are Satanic forces and a secret Catholic Church organization known as Probono Dei.