The Map of Love [suggested by Helen Close]

In 1900 Lady Anna Winterbourne travels to Egypt where she falls in love with Sharif, and Egyptian Nationalist utterly committed to his country’s cause.
A hundred years later, Isabel Parkman, an American divorcee and a descendant of Anna and Sharif, goes to Egypt, taking with her an old family trunk, inside which are found notebooks and journals which reveal Anna and Sharif’s secret. [product description from Amazon]
Author’s Wikipedia page.
Author’s website.
Shortlisted for this month
The book selector for the month can choose up to three books for nomination. This Month Helen selected only one book.