The Messengers (2007)

The Solomon family has left the fast paced life of Chicago for the secluded world of a North Dakota farm. Amidst the tranquil sway of the farm's field of sunflowers, Jess, 16, soon realizes how terrifying seclusion can be when she and her brother Ben, 3, begin seeing ominous apparitions invisible to everyone else. When those specters become violent, Jess' sanity is questioned--a double jeopardy for the tormented teen. Her troublesome past comes face to face with the past of those who once lived in the house, a perilous confrontation that leaves her believability in question with those she desperately tries to warn before it is too late.