THE CAIRO THRESHOLD

It went dormant forty thousand years ago. It just came back on. Dr. Nadia Rostova has spent her career reading genomic monitoring data for anomalies that turn out to be equipment error. This one isn't. Deep in North Africa's Western Desert, a sealed chamber - built with a precision no Paleolithic culture should have possessed - is producing an active biological signal, and Nadia's system caught it in real time. As she assembles a research team to reach the site before the discovery reaches the wrong hands, Nadia learns that the chamber beneath London that ignited this crisis was never the whole story. It was the entrance. What waits in the desert was built to be found - not by chance, but by someone specific, following a signal designed to activate exactly now. Governments are already circling. So is something older than governments. THE CAIRO THRESHOLD is Book Two of The Convergence Sequence - a series in which every new site widens a hidden network spanning continents and millennia, and every answer Nadia's team uncovers raises the stakes for what happens when the whole pattern finally converges.