After the tragic death of his closest friend in a mysterious warehouse explosion, fearless adventurer Mark Alvarado is left with only a cryptic journal, a broken map, and a strange golden fragment linked to the legendary city of San Mistico. Determined to uncover the truth behind his friend's murder, Mark travels deep into the dangerous jungles of South America, where ancient temples, deadly traps, and hidden enemies guard secrets buried for thousands of years.

Guided by mysterious allies and hunted by the ruthless Victor Salazar, Mark discovers that the legendary Golden Calendar is far more than a treasure map. The ancient artifact is part of a powerful mechanism connected to the lost civilization of San Mistico, a hidden empire buried beneath the Amazon rainforest. As the pieces of the calendar are reunited, terrifying truths begin to emerge about forgotten kings, immortal guardians, and a celestial gateway capable of unleashing unimaginable destruction.

Facing monstrous creatures, collapsing ruins, and the growing darkness awakened beneath the jungle, Mark must race against time before a total eclipse opens the ancient gate forever. In a battle between greed and sacrifice, he soon realizes that some treasures were never meant to be found.

The Curse of San Mistico by William Ubagan is a thrilling action adventure novel filled with ancient mysteries, nonstop suspense, dangerous explorations, hidden cities, and legendary secrets that will keep readers turning pages until the very end.