What's your favourite audible book?

To pick a standalone and ignore trilogies and series, I'd suggest Dennis Taylor, Outland -- A standalone book, with excellent and technically convincing story telling. Narrated by Ray Porter who's a gifted and engaging narrator, and exceptionally rare for Audible narrators is an American with a good grasp of convincing foreign accents.

It depends on what kind of genre you are talking about.

For fantasy, I would say "Lies of Locke Lamora" is one of the best Audiobooks ever narrated. There is a character called 'Father Chains', and this character is voiced in an iconic way; I am sure you will like it.

For non-fiction, I would say "The Smartest Guys in the Room" is a canonical account of what happened with Enron. This is an interesting book because there are a lot of common traits shared between Enron and many of the unicorns we see today.

I have others that you might like, but these two come to mind in their respective genres.

Harry Potter is fantastic. Because it is narrated by Stephen Fry.