"Bridge has been deskbound and in therapy for three years after her first field mission in Syria went disastrously wrong. But now one of her best friends has been murdered, and Bridge believes his death is connected to strange posts appearing on the internet carrying encrypted hidden messages. On decoding the messages she discovers evidence of a mole inside a top-secret Anglo-French military drone project. Her MI6 bosses force her back into the field, sending her undercover in France to find and expose the mole... who may also be her friend's killer. But the truth behind the Exphoria code is far worse than she could have imagined..."--Publisher's description.