For a century, Isolde Verlaine has been untouchable. The Madame of the Velvet House-London's most exclusive establishment for those with monstrous appetites-built her empire from nothing. Bound to the ley lines that pulse beneath the city, she's protected her girls, guarded her secrets, and never let anyone close enough to see the woman she buried a hundred years ago. Armand de Lapin has waited long enough. Four hundred years of patience taught the vampire many things, but watching Isolde from the shadows for eight decades has taught him only one: she's worth every moment of the wait. When she saved his life in 1943, she told him he owed her nothing. He's spent eighty years trying to prove her wrong. Now the monster who made her is calling in his debt. Konrad von Harrach gave Isolde her immortality-and the favor she promised him in return. He's coming to collect, and he won't stop at the House. He wants her power, her people, and the soul she thought she'd already surrendered. To survive, Isolde must do the one thing she swore she never would: let someone in. But opening her heart to Armand means confronting the grieving girl she used to be-and risking everything she's built on a vampire who's been waiting a lifetime to love her. THE MADAM is the final book in the Velvet House series, featuring a vampire hero with centuries of patience, a heroine learning to live instead of survive, explicit spice, ancient lovers, vampire claiming, and a guaranteed HEA. This is a series finale that resolves all threads while delivering the romance readers have been waiting for since Book 1. Content warning: Explicit sexual content, historical trauma (WWI era), grief and recovery, references to past suicidal ideation, and a villain who really deserves what he gets.