For A DEATH ALONG THE RIVER FLEET, the image that came to me is essentially what has been portrayed on the cover.
The image was of a disheveled woman, barefoot and clad only in a simple shift, covered in blood that was not her own. In my mind, she had no memory of who she was, or what had happened to her.
But that's where the questions started....
First, I needed to think about where Lucy could encounter her that was plausible. I thought maybe on the London Bridge, but the Bridge had been damaged by the Great Fire, and I didn't think Lucy could be walking in that direction. So I thought about other options, and ended up having Lucy encounter the woman on Holborn Bridge, by the rancid River Fleet when out delivering books.
Then, I began to think about what Lucy would do when she found the woman--how would she react? Lucy, being Lucy, decides that she can't just leave this poor afflicted woman to the devices of suspicious townspeople, and takes her to a physician she knows.
And then that led to more questions. What would a more educated person think about the woman's illness? What kind of healed wounds might the woman have, under closer inspection? How could they learn the woman's identity--what kind of clues could be on her person?
And of course lastly--whose blood was on the woman?
Those are the types of questions that I would ask myself, to keep my story moving forward....
If you are interested in reading an excerpt, you can see how these questions involved into the story at the heart of A DEATH ALONG THE RIVER FLEET.