7eventh Sense - The Senses Novels, #5

Children of a dying world. Conceived and born at the same moment 6, 500 miles apart, they are exact duplicates in every respect. Violet and Sumire will reach their tween years on a planet rapidly falling into ruin. Plagues, darkness, and poisoned oceans are only a fraction of what they will endure as these two girls race to find other people with abilities like their own. Endowed with the one talent that might enable our heroes to have a fighting chance against a foe as ancient as time itself, Sumire and Violet are relentlessly pursued by the terrifying agents of this enemy.
The globe-spanning chase is just beginning. Prepare for a mind-bending adventure of nonstop action and terror.