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Shelter From The Storm: A Hard-Boiled New Orleans Legal Thriller (Tubby Dubonnet Mystery #4) (The Tubby Dubonnet Series) by Tony Dunbar
Reprint from 1997
To out-of-town kingpin Willie LaRue, Mardi Gras seems the perfect time for a New Orleans heist - nobody, but nobody will be thinking about a single other thing. Parties, parades, chaos, alcohol - who could be concerned about a little thing like a bank job? Indeed, all might have gone well except for an out-of-season frog-flogger that threatens to flood the French Quarter - something even Hurricane Katrina couldn't do.
Book 4 of 8 in The Tubby Dubonnet Series (8 Book Series)
https://www.amazon.com/dp/B00EFIOGW6/
https://www.amazon.co.uk/dp/B00EFIOGW6/
https://www.amazon.ca/dp/B00EFIOGW6/