Audiobooks are tough. I had "A Prayer to Saint Strelok" turned into one and listening to the auditions was brutal.
Even tho I specified 'no accents. focus on the tone of the story', 7 out of 10 tried to act/dramatize their way through it with terrible, distracting effect. Others sounded like perky newscasters reporting the weather. Utter detachment/incomprehension of what they were reading. In the end, I went with a college-age kid with extensive theater experience.
He did well, BTW.