This was a relatively easy book to write, as the two sections had been prepared for earlier books, in which they could not find space. Ex-prostitutes were originally researched for the crime section of City and Guild. The section on time lost witnesses is left over from Realms of Power : Faerie and it’s similar to Rise and Fall from Tales of Mythic Europe.
The main source is a book called “The Medieval Underworld” by Andrew McCall. I’ve heard from some of the other authors that they thought the historicity of this work is problematic, but the ideas, as role-playing material, remain good.
The Anonymous in the dedication is my daughter, whose name we had selected, but not told anyone, at the time. There’s a delay between final manuscript and printing in Ars, and so she was born by the time it was published, I believe.