Erin Neal’s world is thrown into depression and isolation since the death of his girlfriend Jenna Kalin, a dedicated environmentalist. Erin has been living within the secluded protection of the Arizona desert for the past few years, when he is visited by Homeland Security. The unscheduled meeting brings news of a suspicious bacterium that has stopped the production of vital oil wells in Saudi Arabia. Erin is an expert in the bioremediation field, which deals with the use of bacteria to clean up toxic spills.

After studying the bacteria, its ability to devour oil and destructiveness to drilling equipment, seem minor compared to its ability to spread. Soon it is discovered that this bacteria has been found in other oil wells in other regions of the world.

If efforts of containment fail, it will permeate through the world’s petroleum reserves and ultimately end the industrial world. As a result, the energy that provides heat, electricity, food, and all that is necessary for survival will be no longer exist.

However, the more Erin studies this world-changing sludge, the more he comes to the realization that he recognizes its traits. Questions of the past flood Erin’s mind, and "what ifs" plague his heart. Just as a familiar stranger re-enters his life, he not only becomes the target of a killer, but he has also been named as the terrorist who is responsible for the creation that has brought disaster upon the world.

Kyle Mills has the power to make the reader beg for more. He is created a genius thriller that has the potential of becoming a movie screen hit. Very few books keep me reading deep into the wee hours of the morning, but Darkness Falls accomplished this with ease. Mills has developed the word "thriller" to the utmost.