According to
Caravaggio, the Germans sent a spy named
Eppler to Cairo in 1942 with a copy of the
book Rebecca by Daphne du Maurier as a code book to send messages back and forth.
Almásy guided Eppler through the desert. After leaving Eppler in Cairo, Almásy went back into the desert and British Intelligence lost track of him. Plus, Caravaggio says, the man who caught Eppler in Cairo was named Sansom, which explains why the English patient wanted to name the dog Delilah.