This act of literature hacking was more challenging than it might seem. Women in Victorian era Britain were not expected to be educated professionals. In the middle and upper classes, they were expected to marry, bear children and manage the servants. Indeed, from my studies, it would have been impossible for a woman to get a medical degree in Britain at the time. Hence, Dr Elizabeth Watson had to study medicine in Paris, which was more liberal then.
I also had to make some decisions about how masculine I would allow Felicity and Elizabeth to behave. Smoking a pipe seemed inappropriate, but cigarettes seemed reasonable. Claret seems more ladylike than whiskey. Fortunately, the rational dress reform of the 1880s allowed – sort of – the two women to wear clothes compatible with private investigation.
As a result, a number of the details have been changed to create believable characters who could plausibly exist towards the end of 19th century. But the stories themselves and the detective's methods of solving mysteries are unchanged from the originals.