The author Caleb Carr is a very interesting guy himself. Really a militarily historian mainly. After reading
The Alienist. I kept reading his novels and while none reached that level they were worth the time.
Other Kreizler books:
The Angel of Darkness - good sequel
Surrender, New York - another in series, but mostly upper New York
The Italian Secretary - a so so Sherlock Homes story
The Legend of Broken - A try at fantasy, just couldn't get into it totally
The Devil Soldier - a very interesting non-fiction biography of a American soldier in 19th century China
"Facts no longer exist. Everything is a "point of view" now."
Daniel Suarez's 2011 "Freedom"