The Wolf and the Snake (English version)

In 1099, a mysterious child of noble origin was taken in by Jews who had fled the Crusaders' arrival in front of Jerusalem.
Years later, Ada, the descendant of this child, travels through Palestine with her father. He's a merchant and knows medicine. Ada is still very young when her father saves the life of a badly wounded knight.
Sick and aged, the merchant now lives in the West with his daughter, who has grown up.
Close to death, he asks a great favor to the man saved in the past. Ada, a young commoner but descendant of a mysterious lineage, becomes the wife of Reyn, the knight's son.
The new husbands barely get acquainted when Reyn must embark with King Louis IX's army for Egypt.
It's the seventh crusade.
'The Wolf and the Snake' is a historical romance spiced with fantasy.
This story tells of the desire to conquer, the desire to love, and never to die.