The Nikopol trilogy

For thirty years, Herakles Nikopol has floated alone in space, sentenced to cryopreservation. When he finally returns to Earth, the year is 2023, and the world has been ravaged by two nuclear wars! But the strangest change in the world floats above Paris a giant pyramid, home to the recently returned Egyptian Gods, who would like to reclaim humanity as theirs, if only they could all agree ...