Moon Shadow by Patricia Barletta

In the dead of night outside Paris, Antonio, Duke of Auriano is ambushed by a highwayman. The thief steals not only his coin, but also snatches the magical moonstone he wears as protection against the devastating cravings of the Hunger, a consequence of his family’s curse. Antonio vows to find the thief no matter what and take back what is his before the curse turns him to Shadow forever.

Solange Delacroix is forced to live in a twisted maze of lies and deceit. Nothing in her life is what it seems. She is the cunning highwayman forced to steal for Le Chacal, King of Thieves. She is the beautiful and seductive Madame de Volonté, mistress to the cruel Marquis de Vernoux, who watches her every move as she runs a salon of the demimonde. When she steals a moonstone from the handsome stranger and he turns up at her salon seeking the stolen item and revenge, she struggles to keep her life from toppling into a maelstrom of deadly peril. But then a mysterious, seductive Shadow visits her in the night and offers a bargain and the possibility of freedom. Is this her salvation, or is she making a deal with the devil?

Antonio and Solange come together in a dangerous dance of secrets, thievery, and passion. Hounded by the evil sorceress Nulkana, threatened by the ruthless King of Thieves, menaced by the vicious Marquis de Vernoux, their safety hangs in a precarious balance. Will their burgeoning love and trust in each other be enough to help them come out alive?