Absentia.
I just watched this movie, which my wife got me for Valentine's Day.
A troubled recovering addict named Callie reunites with her pregnant sister Trisha, who is in the process of declaring her husband, Daniel, who has been missing for seven years, dead in absentia. Trisha wants to move on with her life, and has a mutual attraction to Ryan Mallory, the detective on her husband's missing person case, even though she's having horrific visions of her husband, which she chalks up to just stress and guilt. And then, Daniel shows up alive, but in terrible physical condition (having eaten animal bones and sunlight deprived), and is in even worse shape mentally. All he can say is, something terrible had taken him underneath. Then when Daniel disappears again, and the only witness to what happened is Callie the recovering drug abuser, with her unbelievable story about some sort of insectoid monster taking him into the wall, both Trisha and the police think she had to have been stoned. Callie begins to realize the terrible truth about people going missing in the neighborhood in connection to a nearby overpass tunnel, where in fact another missing man turned up dead, his body twisted and mutilated. And when Trisha is taken by the creature, Callie goes to trade herself for her sister, until she realizes how cruel and treacherous the thing is.
I had read very good things about this horror film, and I'm happy to report that it lived up to the hype.
_________________
-Bill, otherwise known as Kraichgauer