Book 1

Sisters of Blood and Spirit

by Kady Cross

Published 31 March 2015
Wren, the ghost of a girl who died at birth, and Lark, her depressed misfit living twin, help a boy who saves Lark from a suicide attempt and who is being threatened by the malevolent spirit of a long-dead serial killer.

Book 2

Sisters of Salt and Iron

by Kady Cross

Published 29 March 2016
Lark Noble is happy. She finally has friends people who know she can see and speak to ghosts and still care about her and she has Ben, the cute guy she never saw coming. Wren Noble is lonely. Unable to interact with the living, she wants to be happy for her sister's newfound happiness, but she feels like she's losing her. It doesn't help that Kevin, the very not-dead guy she was starting to fall for, seems to be moving on.