Darkest Dawn - J.B. Burke Tucker

The end begins with a streak of light.

After escaping the depths of the Iranian mines, Kirie and Luca are on the run with few friends and even fewer options. Loyalty lines have been blurred, and more than Shadowmen hunt them. Determined to stop The Order from setting their endgame plans in motion, Kirie and Luca must operate outside the very system that once shielded them from Darkness. 

For an eternal being, Darkness had little patience for our deaths.

The enemy is on the move. Armed with a stockpile of uranium and key information from within The Society of Light itself, there is little hope anyone can stop them. As the end-of-days timer ticks down to zero, Kirie is faced with her greatest fear-she and Luca, the strongest Bright Ones in history, may not possess the power to banish The Void from the Earth before everything goes dark.