Murder on Astor Place is the first book in Victoria Thompson’s Sarah Brandt series. It has dropped to $1.99 at Kindle US and Kobo US. I read the first several books in this series way back in paperback days and liked them, but lost track of the series during my transition to e-books, since the later titles rarely go on sale.
Murder on Madison Square is the 25th and most recent in the Sarah Brandt Malloy/Gaslight series – at least until the 26th comes out in April. It has dropped to £1.99 at Kindle UK right now.
Kindle UK: https://www.amazon.co.uk/dp/B09B94NF35