Three years ago, Anwen Osei walked out of Caspian Holbrook's life without a word of explanation. This morning, she walked back into his boardroom to pitch the biggest contract of her career — and prayed he'd never find out why she really left. She built a business. She raised their son alone. She kept the truth buried under three years of careful distance. Then Caspian's hand found the small of her back, his mother remembered exactly why she never trusted her son's designer, and an unknown number lit up Anwen's phone with a warning: some doors, once opened, cannot be closed again. Caspian Holbrook doesn't believe in half-measures. He claimed his son the moment he learned the truth, and now he wants Anwen back on the same terms — completely, publicly, permanently. But someone inside the Circle is determined that history repeats itself, and this time, walking away may not be Anwen's choice to make. The Billionaire's Secret Baby is a second-chance, secret-child romance with a ruthless, unapologetically possessive hero who has already decided this family is his to keep. Can be read as a standalone, or alongside The Billionaire's Contract Bride and The Billionaire's Enemy.