Crystal Daniels and Sandy Alvarez are sisters who have co-authored several books together since 2017.
The Kings of Retribution MC series- Undaunted, The Darkest of Light, Finding Solace, Defy ,Unbreakable, Lost King, and Prospect. Along with, The Kings of Retribution MC Louisiana Chapter- Riggs, and Wick. Other books include, Demetri The Volkov Empire, Leather and Mistletoe Novella, and Love above Law.
When they are not writing you will find them spending time with their families or curled up with a good book.