'Violca's Vow' by Leilani Love is book 2.5 in the "The Dragon Ruby" Series. This is a Novella size book so it an easy read.
I would suggest making sure to read the first two books as this book is a continuation of the other two books. I enjoyed the first two books 'Violca's Dragon' and 'The King's Fire' so just for that reason alone they are worth reading.
This continues the story of Violca’s and Chase. Violca is planning her and Chases's wedding along with raising her sisters still. Along with all of that going on Violca and Aithne (heroine from book two) are trying to get a meeting with the Vampire King to see if they can't get a truce going.
I don't think I can say enough about this series! I was so happy to see this book and so hope that we will be seeing the sister's stories very soon!