In the beginning was the Logos … When a respected Freemason is executed in a mysterious Templar cave, the police turn to antiquities investigator Vincent Blake for assistance. What was the Freemason protecting? And who would kill him for it? After a second Freemason is murdered, Blake discovers a coded letter written by London's genius architect Christopher Wren that sets him on a collision course with a sinister enemy who will stop at nothing to achieve their diabolical goal. In a frantic battle against time, can Blake and an unlikely ally crack Wren's "Logos" code before his ruthless adversary unleashes hell on earth? In this final instalment of the Dark Horizon Trilogy, Blake's greatest discovery becomes the world's greatest threat, as the future of all things hangs in the balance.