Among Sand and Sunrise - An American Heiress, Book 3 (Unabridged) (Stacy Henrie).

This is the third book in the Among Sand and Sun Series by Stacy Henrie. It is a reincarnation of an old man and his woman who where buried alive before. The woman is referred to as a heiress and had known the man since birth. She meets other people who seem like lost souls and joins them in their journey to save themselves and uncover some ancient secrets. They face their old enemies, who are after the treasure they discover, and the various clashes that come with unexplored desert adventures.