If someone is well versed in cryptography, on Earth they are considered crazy. Elsa lives in a written world. She is almost 17. Soon Elsa will receive Veldana's book and take care of her. But something goes wrong. The boundaries of the world are unstable. Its creator, the famous European cryptographer Charles Montaigne, is killed and Elsa’s mother is kidnapped. The girl sets off from Veldana to Earth to find her. In Italy, she will meet a secret society of scientists - a mechanic, an alchemist and a cryptographer, learn about the most dangerous weapons of all time and lift the veil of a political conspiracy. Elsa was born for science. But will she cope with the role of Veldana's caretaker?