Pure Hell (Seventh Level #1) by Charity Parkerson

Not good enough for heaven but not bad enough to burn.

Kylie has a slight problem. She’s dead and trapped between the realms. Left with no options, she follows Detective Liam Stone on the hunt for her killer. Death has left Kylie invisible but does nothing to dampen her desire for the sexy detective. Instead, it gives her the freedom to do as she pleases with his body, and what a delicious body it is.

Liam’s determined to solve Kylie’s case but as the clues uncover an underground world of demonic torture and pacts, Liam must face his own secrets or the flames of passion won’t be the only ones the couple will have to face.