William Ryan
William Charles Ryan
Alexei Korolev, a captain in the militia’s Criminal Investigation Division under Stalin, in 1930s Moscow, Russia:

The Holy Thief (2010) [review]
Finalist 2011 Barry Award for Best First Novel
Finalist 2010 New Blood Dagger Award

The Darkening Field (2012)

The Twelfth Department (2013)
Finalist 2013 Historical Dagger Award