They say a picture can tell a thousand words...but what if it's sending you a message from the dead? Aspiring horror writer Gwen Coleman and her workaholic husband, Noah, have finally found their dream home and quickly move in with their young daughter Harmony and infant son, Caleb. What begins as an unexplained shadow in the background of their daughter's photograph, soon turns into an imaginary friend named Maria. It doesn't take long before Gwen notices a change in her daughter's personality. When Gwen begins receiving eerie text messages and videos from an unknown sender, she worries Maria may be more than a figment of her daughter's imagination. As the secrets of her new home are revealed, Gwen discovers that perhaps her life has become the most frightening horror story of them all.

When Molly Heyworth comes across an eerie video on the internet, she believes it to be a hoax. It’s an early instalment to a video blog detailing the Garrison family’s home renovations. On her computer, Molly watches the couple tearing down a wall to reveal a room, where no room should exist. But what unnerves her is the strange altar the Garrisons find inside, where strange symbols on the walls and remnants of blood hint at Satanic rituals. As the weeks pass, Molly grows increasingly preoccupied by the family and their tragedies, especially with the two young boys, who are particularly plagued by the forces within the house. When the youngest goes inexplicably missing from inside the house, Molly’s interest turns to obsession. The more she unravels, the more it becomes clear that the horror has already devastated the Garrisons’ world, but for Molly the horror has only just begun.