ALL of the Elizabeth Moon "Graphic Audio" books from the Serrano Legacy series.
They are all 22,500 (32-64k VBR).

Graphic Audio - Elizabeth Moon - Serrano Legacy
        01-Hunting Party    217.0MB
        02-Sporting Chance    261.0MB
        03-Winning Colors    262.0MB
        04-Once a Hero    282.6MB
        05-Rules of Engagement    301.2MB
        06-Change of Command    301.0MB
        07-Against the Odds    320.3MB

SERRANO LEGACY
Heris Serrano was an officer born of a long line of officers. Being forced by a treacherous superior to resign her commission under a cloud was not just the end of a career path; it was the end of everything that gave her life meaning. Still, even ex-captains grieving for lost careers must eat, and Heris has wound up as "Captain" of an interstellar luxury yacht. Being a rich old lady's hyperlight chauffeur isn't quite the same as captaining a dreadnought, but nothing Heris will ever do again will compare to that.

Or so she thinks... For all is not as it seems aboard the good ship Sweet Delight, and soon Heris finds herself fighting for her life against as varied and villainous a bunch of cutthroats, smugglers, and "sportsmen" as ever had the misfortune to cross her path when she was a captain of the fleet.