I Trapped the Devil

Around Christmastime, worried about the safety of his estranged brother, Steve, Matt and his wife, Karen, show up unannounced at his house. There, a shocking revelation awaits, as troubled Steve announces that he's got someone locked up in the cellar, and this stranger is none other than evil incarnate. But, even though Steve is convinced that he has captured the seed of evil, the prisoner is begging for his life; then again, the man, or the thing, behind the basement's wooden door seems to be toying with his captors, and his deep, creepy voice sends shivers down the spine. Is this really happening? Has Steve managed, indeed, to trap the Devil?