The Vampire Prince’s Forbidden Heir. The Nightveil Vampire Dynasty, #1

Five years ago, hematology researcher Tessa Vale shared one unforgettable night with Caedric Valtaren-and disappeared when she learned he was a vampire prince. She built a quiet human life around the daughter he never knew existed. But on Liora's fifth birthday, the impossible child falls gravely ill, and the only blood that can save her belongs to the father Tessa left behind. Returning to the hidden kingdom of Nightveil means facing Cade, a merciless royal court, and an ancient prophecy that names their daughter the living crown.
As forbidden desire reignites between Tessa and Cade, they uncover poisoned blood, stolen memories, and a conspiracy that began long before Liora was born. Someone inside the palace has been waiting for the child who should not exist-and will destroy anyone who stands between him and her power. To save their daughter, Tessa and Cade must confront five years of heartbreak and choose whether their love is stronger than destiny.
But in a kingdom built on stolen blood, choosing each other may be the most dangerous rebellion of all. The Vampire Prince's Forbidden Heir is an emotionally charged vampire romance featuring a secret child, royal intrigue, reunion, ancient blood magic, and a hard-won happily-ever-after. It begins The Nightveil Vampire Dynasty series.