After the case in Japan, El-Melloi II's party was invited to Egypt.
What waited them there was a second Library of Alexandria, supposedly lost to time. And the collaborative excavation team of Atlas and the Clock Tower went to explore the Library.
It was decided that El-Melloi II and Gray had to join the exploration team to solve a mysterious incident, while Ergo and Rin were faced with another young Atlas alchemist, Sion.
Volume 4 of The Adventures of Lord El-Melloi II, mixing desert and ocean, Age of Gods and present age.