A German spy who was sent to Cairo in 1942. According to , Eppler was led across the desert by a Hungarian desert explorer named with a secret code hidden in a copy of
Rebecca. Eppler was apprehended by British Intelligence, but his guide, Almásy, disappeared into the desert. The character of Eppler is based on Johannes Eppler, an actual German spy during World War II who was raised in Egypt by his Egyptian stepfather.