City of Light — Keri Arthur

When the bombs that stopped the species war tore holes in the veil between this world and the next, they allowed entry to the Others -- demons, wraiths, and death spirits who turned the shadows into their hunting grounds. Now, a hundred years later, humans and shifters alike live in artificially lit cities designed to keep the darkness at bay....

As a déchet -- a breed of humanoid super-soldiers almost eradicated by the war -- Tiger has spent her life in hiding. But when she risks her life to save a little girl on the outskirts of Central City, she discovers that the child is one of many abducted in broad daylight by a wraith-like being -- an impossibility with dangerous implications for everyone on earth.

Because if the light is no longer enough to protect them, nowhere is safe...