Hellbreeder (2004)

Five years ago Alice saw her son murdered; now every day is consumed with the need to find his killer. In the sleepy town of Ludlow, the arrival of the mysterious stranger who Alice suspects of being the killer of her son coincides with a renewed spate of horrific child murders. Now a weary detective must uncover the truth behind the killings before another child is killed; and Alice must face the unbelievable truth behind the death of her son before insanity, grief and guilt break her mind