Shimmer (The Rephaim, book 3)

Gaby Winters' life used to be pretty normal. She lived with her best friend. She worked in a library. She was slowly getting over the death of her twin brother, Jude. Until Rafa arrived. Now Gaby has discovered she is one of the Rephaim - descended from fallen angels. She knows demons exist. That they are coming for her. And that Jude might be alive. What she does next could change everything.

If you loved Becca Fitzpatrick's HUSH, HUSH, this is the perfect book for you.