The Shadows of Empty Men

A troubled girl. A cabal that believes her possessed by an avenging spirit. A detective who will stop at nothing to protect her.
When PI Adam Park is retained to confirm the accuracy of a young heiress's family tree, it sounds like the simple case he needs to break the monotony of life on an Aegean island. But it soon becomes clear that others wish to stake a claim to the girl's fortune, and something as inconvenient as a private investigator will not stand in their way.
As this group calls upon a shadowy killer known as the Pale Boy, Adam's attention turns to the girl herself, learning her illness is viewed by some as "possession" by a spirit intent on righting wrongs from Porajmos, or "the Devouring", the Romani genocide inflicted by Nazi Germany. And even those who profess to represent the girl may not hold her best interests at heart.
Delving into a decades-old secret that people will murder to protect, Adam must fight smart and fight hard-against a seemingly supernatural mercenary, against people of unfathomable greed, and against his own darkening nature.
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Adam Park novels are international mystery & crime thrillers that stand alone as one-off adventures, or can be read as a series charting one man's evolution from a simple investigator to a true hard-boiled detective.
This is the reading order so far:
1 The Dead and the Missing
2 A Desperate Paradise
3 The Shadows of Empty Men
4 Night at the George Washington Diner
5 Master the Flame
6 Under the Long White Cloud