Michael Evans has just moved back to Indiana following his father's unexpected death. Having dropped out of medical school, he decides to take a job at his father's hospital, while sorting out his father's estate and figuring out what to do next with his life. Michael had always observed strange people and occurrences that he could not explain. As a small child, he had an army of "imaginary friends," or so he thought. He managed to rationalize these odd relationships and occurrences until beginning the graveyard shift at St. Mark's, a hospital with a tragic history. And the dead in this place let Michael know they never left. Navigating a new job and attempting to engage in a social life is challenging enough, but not knowing if the person beside you is of this world or the next can create real problems.