: Kyella has been imprisoned by the Thaician Emperor, Malakai, who forced her into a blood bond. Despite the mental and physical toll, she remains an "anomaly" by resisting the call of his blood.

: During a banquet where she is paraded as a blood source, three foreign Vampyre Lords— Dakoth, Kolvar, and Elijah —intervene. They are spies from a distant land who risk their mission to rescue her, lighting a spark of hope she thought was dead.

is the first book in The Vampyres' Source trilogy, a dark paranormal romance co-written by USA Today bestselling authors R.L. Caulder and M. Sinclair . The story follows Kyella , a strong-willed woman forced into being a "thrall"—an unwilling servant and blood source—to a brutal Vampyre King. Story Overview & Plot

: The narrative focuses on Kyella’s journey from a captive "source" to a powerful figure who discovers she possesses unique abilities, including a venom that can kill vampires. Reader Consensus & Review Highlights Ruthless Blood (The Vampyres' Source, #1) - Goodreads