[sufue]

An omnibus of the first three titles in the Inspector Pekkala series by Sam Eastland is available for $4.49 at Kindle US and $4.99 (coupon/VIPable) at Kobo US. Titles are Eye of the Red Tsar, Shadow Pass (apa The Red Coffin), and Archive 17 (apa Siberian Red). SYKM indicates that the second title was a finalist for the 2011 Historical Dagger award. Given that individual titles are over $10, this is a pretty good deal. A couple of the titles have been on sale before though, so check carefully before you buy...

Kindle US: https://www.amazon.com/Inspector-Pek...dp/B071G3GV8Q/
Kobo US: https://www.kobo.com/us/en/ebook/the...kala-mysteries

Spoiler:

The Inspector Pekkala thrillers take place in the treacherous world of Stalin's Russia.

The main character, Inspector Pekkala, was the chief investigator of Tsar Nicholas. Dubber 'The Emerald Eye', his watchful gaze protected the Romanovs from internal and external threats to their security.
When the Bolshevicks seized power and executed the Romanov family, Pekkala was thrown into the gulag.

But when Russia comes under threat from an insurgent Nazi Germany, Stalin brings Pekkala back from his Siberian exile, appointing him the chief investigator of the red Tsar.

As the threat of a Nazi invasion increases, Pekkala finds himself searching for the Romanov's lost gold, investigating the sabotage of Russia's secret weapon, and attempting to rescue the Tsar's amber treasures from Nazi looters.