For more than ten years, Catherine Langford has watched her father labor over the mysterious ringed device he discovered in the Egyptian desert back in 1928. With answers eluding them both and funding running out, the Langford's situation has become desperate. As the Professor makes plans to move the ring abroad, Catherine struggles to hold on to her life in Cairo, Egypt. But when mysterious figures show up at their facility late one night, new light is shed on the device in a most sinister way.
Dr. Brücke's intentions become clearer as he puts his theories about the Langford discovery to the test. As the ring's potential is revealed, Brücke decides to kidnap Professor Langford as Catherine is held hostage by one of his loyal soldiers.
Cleverly eluding her captors, Catherine recruits the help of two soldiers for a rescue mission into the unknown. Meanwhile, Professor Langford and Brücke come face to face with a powerful new force.
The team's travels bring them into dangerous territory, and Catherine discovers that getting home won't be as easy as she thought. Matters are complicated when two new faces present themselves, but could one be a potential ally?.
As Aset learns of new interlopers on her territory, Brücke schemes to win her favor. Catherine and the team are follow the lead of their mysterious guide, but his intentions remain unclear as they navigate their new surroundings.
Professor Langford is forced to help Brücke and Aset negotiate an uneasy alliance that threatens the to unleash an unspeakable horror. Meanwhile, Catherine and team get a much needed stroke of fortune as Wasif's miraculous recovery is followed by a dramatic change in heart by their captors.
Aset finally reveals her end of the bargain, giving Brücke the chance to dream up a new and terrible plan for his return to Earth. Meanwhile, as Catherine bonds with the team's new friends, she discerns the terrible ramifications of what might happen if Brücke finds a way off this planet.
Catherine, Beal, and Wasif are unfortunate witnesses as Aset and Brücke bring their deadly game of posturing to the Nosdevli tribe. In an effort to try and assert his authority, Brücke overplays his hand leaving him with few allies left.
United in a common goal, Catherine, her team, and the Abydonians put a plan in place to stop Brücke. But, as Professor Langford attempts to create a divide between Aset and the Nazis, a new complication arises.
A new presence brings danger to everyone on Abydos, including Aset. As chaos ensues, Catherine and Beal make a last ditch effort to bring everyone to safety.