Not so long ago, Sayhan, a hired killer, worked for the sinister Guild organization. But now she has escaped from it, joining the group "Sigma", carrying out secret tasks of the American government. And now Seyhan needs to find out all possible information about his former employers. She found a scientist from the Guild, who is ready to give her important documents in a personal meeting in Paris. However, there the girl fell into a trap. To free herself and get the documents, she must save the son of a scientist caught in the clutches of a bloody religious sect. To do this, Seyhan will have to walk the path of the dead and get the key to the ancient and terrible secret. The key that will open the "Sigma" doors of all secrets... For the first time in Russian! A new work by James Rollins, which is the prehistory of the novel "The Devil's Colony"!