One cursed sapphire, two broken hearts, and a race against time to end a deadly legacy... Can love rewrite fate before Christmas morning?

When art historian and jeweler Emma Sinclair, a vivacious American in her 30s, is invited to Italy over the holidays to appraise a rare, mysterious gemstone rumored to be linked to the Italian Renaissance, she jumps at the chance. What she doesn't expect is for the client to be Maurizio Ferrante, the elusive billionaire whose name she's only heard in whispers.

Maurizio hires her reluctantly, partly because of his strict privacy and partly because of a shocking rumor: the gemstone Emma is appraising may have been in the possession of his late fiancée. As Emma begins her research, she discovers hidden letters, possibly linking Maurizio's fiancée to a hidden lover, secrets, and betrayal.

Thrown together by work, the pair's undeniable chemistry ignites. Despite Maurizio's resistance, he can't help but be captivated by Emma's charm, intellect, and warmth. Emma is intrigued by the mysterious billionaire, and as they explore the Italian countryside, the festive lights and wintry magic of Christmas in Tuscany begin to thaw the ice around Maurizio's heart.

As they uncover secrets about the gemstone and its complicated history, they realize the mystery is far from romantic. It leads them to a dangerous game of greed and deception—someone else desperately wants the gemstone, and they'll go to any lengths to get it.

In a dramatic Christmas Eve climax, Emma and Maurizio must race against time to protect the gemstone, their budding love, and each other.