258 BC.
As the blood of Christian martyrs flows in the Roman arenas and the persecutions against them become increasingly harsh, Pope Sixtus secretly gives the most precious relic to a devoted faithful. However, immediately afterwards, the sacred symbol is lost in the darkness of time.

1684.
Samuel Pips oversees the evacuation of the English colony in Tangier, with the visible threat of Mauritanian pirates. At the same time, he unofficially searches for the priceless treasure that reappears, through the cracks of history, after a thousand and more years.

Today.
Archaeologist Jack Howard and his team are exploring a 17th-century shipwreck off the coast of Cornwall. The findings lead him to a sunken pirate city in Port Royal, Jamaica, where an ancient mystery is hidden...

However, the descendants of the Holy Inquisition follow his every step, and Jack will face a descent into hell itself in his attempt to bring to light the legendary Holy Grail.