I’ve heard, and I don’t know if this is true, that voice actors who specialize in narrating books have to be superstars at this. Not only are they expected to be able to sight-read an entire book without making mistakes, they also need to do the required acting so exciting scenes are exciting, happy scenes are happy, gloomy scenes are gloomy, etc. Plus, as they come across new characters in the book, they’re supposed to be able to give them distinct voices and remember and recreate those voices as they show up later in the book.

Of course, a blockbuster book with a big budget for the audio version won’t have an actor wing it. They’ll be able to pay to have an actor and a director read the book first, and then have the director work with the actor to tease out the best possible performance. But, for a smaller budget, you have to deal with tighter margins so every second in the voice over booth counts.