Gheist is now available as an audiobook, narrated by Lesley Desalles:
UK: audible.co.uk
US: audible.com
The Harrowed Garden is narrated by Craig Andrew Mooney:
UK: audible.co.uk
US: audible.com
You can also get The Harrowed Garden in Spanish ebook.
Enoch's Vault, narrated by Paul Metcalfe, is also out:
UK: audible.co.uk
US: audible.com
If you're interested in a review copy, drop me a line.