Nightmare Rising — Cari Silverwood

Centuries in our past, an alchemist tears a rift in reality and humankind's nightmares and dreams invade this world. Solid as mist, as seeable as a sigh â€" they want to kill us, to possess us, to use us as their whore.
Soon…they whisper to themselves.
Saviours may come from dark places.
Teenagers swimming in a creek. Blood drifting deep. When Zara is young, her friend is taken by a killer. For most of her adult life, the man who took her friend stalks Zara with messages on postcards: MISSING YOU. ARE YOU MISSING ME?
She runs, hides.
Running is her best option until she and Valor Lacroix find each other, until the bomb blows up her street and the dead litter the pavement. Someone has reached under her skin, invaded her, and implanted strange abilities and memories. For the first time in forever she has power.
Zara dubs herself the girl most likely to give her friendly serial killer the finger in a terminal way. She's a girl with a knife that stitches nightmares and dreams into skin.
She makes a mental note: begin search for vengeance.
Valor, a CIA agent gone feral, invites himself along â€" he needs Zara for reasons, good reasons. Nightmares are rising, and the worst of them lies beside her.
If you save a monster, don't turn your back.