“The Possession Of Hannah Grace” (*** out of four) was an engrossing horror melodrama about a cop (Shay Mitchell) just out of rehab who takes the graveyard shift in a city hospital morgue but she soon encounters a series of bizarre and violent occurrences involving a mysterious evil force. Are they real or is she just losing her mind? Unusually compelling horror story weaves character development with style and scares into an uneven but overall satisfying whole. Mitchell’s first-rate performance patches up some occasional lulls in the story. Similar to Ewan McGreggor’s “Nightwatch” but far better than that disaster.