I was able to listen to previews from the books published by Simon and Schuster.
They are short stories about the great warlock Magnus Bane and give more background information about Magnus Bane.
Magnus Bane is one of the main characters in The Mortal Instruments books. Written by Cassandra Clare.
The Magnus Bane Chronicles audiobooks are out with great voices.
Andrew Scott better know as Moriaty in Sherlock, George Blagden known as Athelstan from Vikings.