Who guards the prince? (Atlantic large print)

Who would sever a tongue from a living mouth? Or kill a pathetic, homeless old man? Or frighten a young doctor into silence? The questions are piling up, and Doug McHarg can't stop asking them, even when he's warned off his inquiries by his boss in the local police force, by Scotland Yard, and by increasingly professional death-threats. The pattern that emerges is that of a shadowy, immensely powerful organization, with a reach that extends to the White House and the English throne. And all that stands against them is the implacable McHarg, one discontented copper with little left to lose.