Тайната на Траките [The Secret of the Thracians]

After many years kept secret by the Thracians from the enemies, Dr. J. Atanasov must find a replacement to continue his work. Shortly before he suddenly disappears, he manages to encode a secret message that only the worthy can read. They must protect the deeply kept secret of the Thracians. If it falls into the wrong hands, the consequences can be fatal.