Her love is his only salvation—and the undoing of everything he needed to survive. An immortal knight. A fearless rebel. A love forged in the fires of revolutionary France. Chevalier Rollant de Montvieux was once a man of honor. Betrayed on the battlefield and bound by a sorceress’s curse, he has spent six centuries serving the French crown—immortal, untouchable, and doomed to lose anyone he dares to embrace in love. As revolution smolders in the streets of Paris, Rollant clings to duty as his only purpose in a wretched existence, until he meets her . Élise has nothing left to lose. Defiant, outspoken, and determined to fight for freedom, she has no patience for kings or the royalists who serve them. But when she crosses paths with Rollant in a spy’s disguise, she senses something different beneath his quiet strength: a man burdened by secrets, trapped in a fate not of his choosing. Drawn together by forces neither can control, their connection deepens in the shadows of a crumbling world. But Rollant knows love is forbidden to him. To hold Élise is to curse her to certain death. As France teeters on the edge of war, Rollant must make an impossible choice: honor his unbreakable oath and protect her from afar—or risk everything, including her life, for one fleeting chance at love. The Darkest Oath is a slow-burn, closed-door historical romance of sacred vows, haunted longing, and forbidden love, with quiet echoes of Beauty and the Beast , set in a world where loyalty can kill and the past refuses to die. The curse is real. The love is forbidden. The oath... was only the beginning. Take the oath. Choose the curse. Step into a world where love is treason and every vow carries a price. ★★★★★ "What truly elevates The Darkest Oath is how it doesn't shy away from the harsh realities of war, betrayal, and the heavy burden of love in a fractured world...provocative and emotionally stimulating... Merewether has created a masterpiece." - Miche Arendse for Readers' Favorite ★★★★★ " The Darkest Oath delivers a haunting Gothic tale set amid the blood-soaked streets of revolutionary France...a captivating love story...a slow-burn romance that will keep the reader riveted to the story. I could not put it down." - Delene Vrey for Readers' Favorite ★★★★★ “Merewether paints an emotional tug-of-war…moments of tenderness in the turmoil of the revolution...Merewether’s fabulous combination is a win. Very highly recommended.“ - Jamie Michele for Readers’ Favorite Content Note: Moderate Violence, Death, Abuse, and Period-Appropriate Religious Themes. No Profanity. No Explicit Scenes. This story is not high fantasy. There are no elaborate magic systems. Instead, magic exists like it did in medieval myth: whispered, elusive, and rooted in fear, not rules. It is mythic and enigmatic by design, woven more through atmosphere and consequence than explanation. ★★★★★ " The Darkest Oath delivers a haunting Gothic tale set amid the blood-soaked streets of revolutionary France...a captivating love story...a slow-burn romance that will keep the reader riveted to the story. I could not put it down." - Delene Vrey for Readers' Favorite ★★★★★ "What truly elevates The Darkest Oath is how it doesn't shy away from the harsh realities of war, betrayal, and the heavy burden of love in a fractured world...provocative and emotionally stimulating... Merewether has created a masterpiece." - Miche Arendse for Readers' Favorite ★★★★★ "Merewether paints an emotional tug-of-war...moments of tenderness in the turmoil of the revolution...Merewether's fabulous combination is a win. Very highly recommended." - Jamie Michele for Readers' Favorite What Goodreads Readers are Saying about The Darkest Oath : " The Darkest Oath surprised me in the best way. I went in expecting a slow burn romance with a bit of historical flair, but what I got was something much deeper—quietly powerful, emotionally rich, and full of tension that lingers." - Liz, Goodreads "Merewether is one of those rare authors whose books always manage to move me, and The Darkest Oath might be her most powerful yet... I lost two nights' sleep because of this book." - Natalie, Goodreads "There are slow burn romances and then there's The Darkest Oath . This was the first book I've read by Ms. Merewether, and it was worth every moment." - Sumi, Goodreads "The Darkest Oath pulled me in with its haunting beauty —gothic atmosphere, forbidden desire, and the kind of love that feels just one breath away from ruin." - Margian, Goodreads "Her love is his only salvation—and the undoing of everything he needed to survive." That single line captures the heart of The Darkest Oath ... haunting atmosphere, emotional depth, and richly layered characters." - Stephanie, Goodreads "I found it to be one of the most quietly powerful books I've read in years. It's about regret and the choices that define us and the ones we're forced to live with." - MT