Bondage
As Andrew Bogle, a former slave from Jamaica, moves farther away from his oppressive home and closer to England, where he will be free, imagery involving bondage and slavery happens less frequently. When Bogle is closer to his home and thus closer to his past as a slave, that imagery becomes more frequent.
Victorian England
There is frequent, vivid imagery surrounding Victorian-era England, which the novel paints a stark picture of. This kind of imagery underscores the harsh conditions many lived in during the era and shows how lucky people like Charles Dickens and Touchet herself are.
Wigs
In English law, attorneys and judges are forced to wear wigs. As the trial grows more intense, imagery surrounding wigs becomes more frequent, illuminating the formality of the entire legal system.
Legal documents
As the investigation and trial are underway, imagery of complex legal documents becomes more prevalent. The trial at the center of The Fraud was called the "Tichborne Trial," wherein an Australian butcher and member of the lower class claimed that he was the rightful heir to a sizeable fortune and noble title from an English man who had died.