A Traitorous Heart by Erin Cotter is a young adult fantasy romance novel published in 2025.

Jacqueline d'Argenson-Aunis is the niece of the royal spymaster and a member of Societas Solis, a secret society that uses magic to protect France.

• Jacqueline is tasked with persuading her best friend, Princess Marguerite de Valois, to marry King Henry of Navarre in order to secure peace between the Catholics and Huguenots.
• She soon finds herself caught in a web of courtly intrigue, dark magic, and a forbidden romance with King Henry.
• When a series of gruesome murders plague Paris, Jacqueline must unravel a conspiracy that threatens to destroy everything she holds dear.

With the help of her friends, Jacqueline must fight to save her kingdom, her love, and her own soul.

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