Not so long ago, Seyhan, an assassin, worked for the sinister Guild organization. But now she escaped from it, joining the Sigma group, performing 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 person in Paris. However, there the girl fell into a trap. To free herself and obtain documents, she must save the son of a scientist who has fallen into 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 an ancient and terrible secret. The key that will open the doors of all secrets to Sigma... For the first time in Russian! A new work by James Rollins, which is the backstory of the novel "Devil's Colony"!