After their last adventure, Nina Wilde has been disgraced and is out of work, while Eddie Chase is working as a bodyguard to movie stars. Things are looking depressing until an undergraduate on a dig in Egypt sees something she shouldn’t have and turns to Nina for help.
Since a time immemorial, the Great Sphinx has been staring, unwaveringly, into an open sky and the sandy desert. Unknown to many and hidden beneath its megalithic frame lies a secret vault that holds the location to the pyramid and the tomb of Osiris.
Macy Sharif is a student in archeology and a part of the team planning to uncover the Sphinx's hidden vault. Things go south when Macy accidentally stumbles upon a shocking discovery involving a religious cult - The Cult of Osiris. The cultists have raided the site and Macy soon realises that they are after an invaluable artefact - the map to the lost pyramid of Osiris.
So what is the secret that lies in Osiris' lost pyramid that's worth killing for?
Nina, Chase and Macy manage to get into the Sphinx's hidden vault where they find a zodiac on the ceiling in the upper chamber which is a star map about six feet in diameter, featuring the constellations carved into the stone in the form of the ancient Egyptian gods.
The Cult of Osiris follows the same formula as other books by McDermott. The story itself reads like a movie script from an action adventure film. Every page dazzles readers with action scenes - from vehicle chases, gun fights, fist fights, and explosions.
Despite that, The Cult of Osiris is better than its predecessors.The story reached its climax about 70% into the story which means the author prolonged the suspense in the story, and this made the book more interesting to read.