While the novel is set in England in 1872, there are occasional scenes from the Orient provided by Sally's opiuminduced dreams as well as by the recollections of other characters. That Pullman has well-researched this era is reflected in his accurate descriptions and his allusions to actual events and locations. The reader is treated to an overview of 1870s England with its crime and poverty, and to a picture of a sick society with its opium dens. Although unfamiliar items such as box lock pistols, mudlarks, and hansom cabs are mentioned in the novel, Pullman explains what they are as he refers to them.

Pullman's vivid descriptions of the setting create an atmosphere of mystery and add to the feeling of suspense throughout the novel. For example, when he describes the town of Swaliness where Sally visits Mr. Marchbanks, Pullman hints at the gloom and impending danger when he...