Graham writes police procedurals set in Prague and historical fiction based in the Dutch Golden Age (around 1670).
His Czech detective, Josef Slonský, has been described by reviewers as “grungy” but lovable. Slonský spent the first half of his career working under Communism, and knows that during that time law and justice did not always coincide. He remembers what he had to do, and assumes that anyone of his age did the same; and since those of his age include his bosses, he feels a general a priori contempt for them. The one exception he will make is for his immediate boss, Captain Lukas, who was an honest man and whose promotion was therefore long delayed. Slonský enjoys a beer or six, often with his reporter friend Valentin, with whom he has been drinking since they were eleven years old.
The Dutch detective, Master Mercurius, is very different. In his mid-thirties, Mercurius is a university lecturer and an ordained minister; very intelligent, but completely innocent in some of the ways of the world. He finds women particularly difficult to understand, since the only one he really knows is his grandmother.