Sisters of Blood and Spirit

http://hip1.sjvls.org/ipac20/ipac.jsp?session=X427316M38386.57652&menu=search&aspect=subtab255&npp=20&ipp=20&spp=100&profile=thq&ri=&term=&index=.GW&x=0&y=0&aspect=subtab255&term=Sisters+of+Blood+and+Spirit&index=.TW&term=cross&index=.AW&term=&index=.SW&term=&index=.NW&term=&index=.SE&term=&index=.STW&term=&index=.EW&sort=3100014Sisters of Blood and Spirit by Kady Cross

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.