The Darkest Oath: A Historical Romance of Forbidden Love, Immortality, and Revolution

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.

And Élise must decide where her true battle lies: in the streets of Paris, or in the arms of a man who may be her ruin—or her greatest salvation.

Perfect for readers who crave:

Slow-Burn, Closed-Door Romance – Yearning, angst, restraint, and emotional intensity without spice

Grief-Wrecked Immortal Heroes – Haunted by centuries, broken by love

Brave, Defiant Heroines – Fierce hearts with nothing left to lose

Gothic Historical Fantasy – Dark streets, sacred oaths, and candlelit shadows

Love That Feels Like Fate – Sacred, tragic, and unforgettable

Curses, Oaths & Ruined Kings – Magic whispered in blood and betrayal

Echoes of Beauty and the Beast – Reverent love, aching restraint, and mythic ruin

Earned Happily Ever After – Hope survives, but not without sacrifice

The Darkest Oath is a historical romance of sacred vows, haunted longing, and love that was never meant to survive, where mythic curses and political unrest collide. A richly woven love story between a loyal immortal knight and a defiant rebel, this novel explores betrayal, legacy, and what it means to fight for the future when your past refuses to die.

This is not high fantasy. There are no dragons, fictional kingdoms, or elaborate magic systems. Instead, magic exists as it did in medieval myth: whispered, elusive, and rooted in fear—not rules. Mystery, not mechanics. It is mythic and enigmatic by design, woven more through atmosphere and consequence than explanation.

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.