Mystery or thriller (maybe book 1 in a series)...Female lead, detective, eventually meets up with an old friend of her father's. I believe father and friend knew served together in Vietnam

[Daniel]

Can't remember the author, but most likely male

[Lobstergirl, au gratin]

When did you read it or when was it published?
Where is the series set?

[Lobstergirl, au gratin]

Daniel, are you still looking for this or did you find it?