The leader of the expedition that disappeared two years ago, British Museum professor Harold McCabe, suddenly appeared in the Sudanese desert. The scientist’s body was in a terrible state - he became a mummy during his lifetime and died on the way to the hospital. During the autopsy at the Cairo morgue, McCabe's brain began to glow. And two days later, the people who were present became seriously ill. An epidemic broke out and half of those infected died. Such events could not pass by the watchful eye of the director of the Sigma squad, Painter Crowe...