The Crimson Manifest

Apius is gone, but his legacy lives on with a brother's promise. Because of this promise, humanity is on the verge of extinction. Famine has swept across the globe as a mysterious pathogen is destroying the world's food supply. Even though agroterrorism is suspected, FBI Special Agent Peter Nichols knows there is much more to this.
Haunted by his long-forgotten past, he hunts for answers — answers hidden deep below an ancient Ceiba tree in the heart of Mexico. Here, protected by a deadly maze of tunnels, is a mythical temple. According to legend, this temple serves as a gateway to the afterlife. It is here where Peter must travel in order to stop the eradication, and Apius's brother, Ezekial.
But how does one stop the dead?