This ‘Threats of Sky and Sea’ novella takes place before the start of book 1, however, I recommend reading book 1 first, for greater understanding and appreciation.
‘Sisters of Wind and Flame’ is the tale of Lady Katerine and her twin sister, Elena, and how they came to be in the King of Egria’s service. We follow the events that led up to Ekaterina changing her name to Katerine, and get to see more of Bree’s Da. A must-read for ‘Threats of Sky and Sea’ readers.
Currently available for free as part of the Kindle Unlimited program.