" Isaac Newton...Detective! A historical mystery, accurate in just about every researchable detail, and according to the author's postscript, even more accurate than I had imagined. It has everything going for it that should have prejudiced me in its favor--set in 17th century London, much of it in the Tower of London, involving codes, cyphers, buried treasure, secrets of the Knights Templar, Arianism versus Trinitarianism and Huguenots versus Catholics, the new scientific outlook versus superstition, bizarre murders, possible ghosts, violence, drugs, explicit sex. What's not to like? And yet I didn't. The characters never came alive. In spite of the technical accuracy, the feel was wrong. There's more historical imagination in two pages of Hilary Mantel. I never really believed the plot. The suspense didn't work. By the time all the bad guys were being rounded up, even the narrator, who has been (metaphorically) kicked in the groin by his beloved, admitted that he no longer cared what happened, and neither did I. And justice was only partially done. Realistic? I guess. Satisfying? No. "
— Jon, 2/16/2014