At an auction, our protagonist acquires an old desk in very poor condition for only 10 euros. While cleaning the piece of furniture a few months later, he discovers a signature hidden under the dirt: Heberlin, an 18th century cabinetmaker.

An accident reveals a sealed drawer containing a mysterious box. Inside, he finds an ancient scroll, a key, and a gold ring. With the help of Professor Martin, an expert in medieval studies, they discover that the manuscript contains alchemical secrets and mentions a hidden treasure.

Their quest takes them to Transylvania, where they discover an ancient fortress and a secret chamber housing the Heart of Veritas, a crystal of dazzling purity, said to be the source of ultimate truth.

However, they are attacked by a man who had previously tried to steal the manuscript. Thanks to the power of the Heart of Veritas, they manage to repel their enemies and protect this priceless treasure.

Back in France, they place the Heart of Veritas and the manuscripts in a safe place to continue studying and protecting this ancient knowledge. Their adventure has only just begun, as they set out to reveal the mysteries of the past and illuminate the future with the light of truth.