In an attempt to solve a strange an ominous mystery, fourteen-year-old Caleb Greene and his younger brother Connor come to believe their mom has cancer. In a curious manner, they simultaneously fall into a real-life treasure hunt for gold buried by an ill-fated prospector from the 1800s. But as they work to figure out the clues left behind, evidence is mounting that something else is going on that may make their current problems pale in comparison.