Night at the George Washington Diner

A PI a long way from home. A diner a long way from anywhere. A biker gang out for revenge.
Traveling through Croatia in his classic VW Campervan, troubled private detective Adam Park is ready to end his sabbatical and return home. But when he stops off at a kitch American-themed diner for some bad coffee and a good burger, the last thing he expects is to intervene in an aggressive domestic incident. And once he sees off the abusive boyfriend, he could not have predicted the guy would return. With friends.
Violent friends.
If he and the other innocents in this isolated place are to survive the standoff until morning, the dark corners of Adam's psyche that he thought tamed must be unleashed once more, forcing him to confront the notion that he may not be a million miles from the people he detests … and to question if he should be returning to a normal life after all.
Night at the George Washington Diner is an action-packed novella, about a third the length of a regular Adam Park thriller, which serves as a bridge between the two longer novels The Shadows of Empty Men and Master the Flame.
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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