There are 4 books in the Sons of Rome series. The newest book is Golden Eagle which came out in 2020.

1
White Wolf

Book cover of White Wolf
NYPD homicide detective Trina Baskin is having nightmares. Vivid ones. Full of blood, and snow, dead wolves…and a young man with pale hair who howls like an animal. She chalks them up to stress and an overactive imagination, too many Old Country stories from her Russian father who, when he’s…
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2
Red Rooster

Book cover of Red Rooster
In New York City, a string of increasingly-grisly murders leads Detective Trina Baskin, and her newly-immortal partner, Lanny, to a frightening facility with designs on studying all the immortals they can get their hands on. When one of their own is abducted, they’ll have to rely on dangerous new allies,…

4
Golden Eagle

Book cover of Golden Eagle
In 1942, Chekist Captain Nikita Baskin led his elite group of Soviet Secret Police into the wilds of Siberia on a mission to retrieve a “volunteer.” Sasha Kashnikov, Tomsk University student and trapper’s son, became a werewolf, an intended weapon against the Nazis. But in truth, he was meant to…