Tru Davies, a medical grad student in Boston whose grant is suddenly pulled out from under her, takes a job at a local morgue. There, she discovers that she has the power to "re-live" the previous day over again to help the people who wrongly ended up dead.

After a stint in rehab, a former police officer begins to question her sanity when she takes on a graveyard shift job at the local morgue. The intake of misshapen female cadaver sets off a series of strange and violent events that confirm the existence of true evil right under her nose. The cadaver, a product of a botched exorcism, is carrying the spirit of a ruthless and evil entity.