Rare Danger by Beverly Jenkins

For Jasmine Ware, curating books for an exclusive clientele is her passion. Until an old friend, a dealer of rare books, goes missing and his partner is murdered. Linked to an artifact smuggled out of the ancient library at Timbuktu, the mystery draws Jasmine deeper into a plot that could cost her her life.
Air force veteran and private security ace Torr Noble is accustomed to adrenaline-pumping stakes. He never expected a private librarian would be so intriguing, but Jasmine is full of surprises. As the connection between them burns hot, a powerful old enemy raises his head. Torr and Jasmine must work together to find the missing dealer.
Will the search be the start of a happily ever after or a disastrous THE END?