Audio for the Sensor Series and the Dragon’s Breath series are available in both digital and CD formats at most retailers (Amazon, Audible, iTunes, etc). To receive alerts for when new books become available, you can sign up here. Be sure to check “audio” as your preferred format and you will only receive emails when new novels are published in audio. If you enjoy ebook and audio you can check both to receive alerts for when either are released.
For Darkness Wanes, it will be released on June 21st, 2016.