Plot
In 2014, James Donahue finds a video on YouTube containing an image of a woman he believes to be his sister Heather, who disappeared in 1994 near Burkittsville, Maryland, while investigating the legend of the Blair Witch. Wanting to find out the truth, he travels to the woods with friend Peter Jones, Peter's girlfriend Ashley Bennett and film student Lisa Arlington, who wants to film James' search as a documentary, The Absence of Closure. Locals Talia and Lane, who had uploaded the video to YouTube, say they will show the group the location of the tape only if they can join.
Ashley injures her foot while crossing a river. Upon setting up camp for the night, Lane and Talia discuss the disappearance of Heather and her crew, the 1940–41 Rustin Parr murders and other mysterious occurrences, which they ascribe to the Blair Witch. Lane explains the witch had not been abandoned on a tree to die, instead tied high up with weights on her limbs to act as a makeshift torture rack.
Strange noises ensue during the night. Everyone awakes at 2 p.m. and sees strange stick figures hanging from trees. Upon Lisa noticing twine in Lane's backpack, he and Talia admit to creating the figures to convince them to believe in the curse. However, they are not able to give explanations for the prior incidents. Upset at their lies, James and his associates banish Lane and Talia from the group and head out of the woods.
After hours of walking, the four have circled back at their original campsite. Ashley's wounded foot and overall health have worsened, which forces the group to stay at the site. Lisa pilots a drone to obtain their location, but from its vantage point they see no way out of the forest. When Peter inspects Ashley's foot, the wound spasms, indicating a potential parasite inside. Peter leaves to collect firewood before being chased by an unknown entity. A tree falls on him and he is dragged away off-screen.
Lane and Talia appear, claiming they have been wandering for five days without a sunrise. Lane, believing the camp to be a hallucination, runs off and leaves behind the disheveled and ravenously hungry Talia. Lisa and James awake at 7 a.m., seeing that it is still dark outside and that larger stick figures have been strung around camp. Talia sees clumps of her hair tied to one of the figures. Ashley accuses her of crafting them and snaps the figure in half; Talia is snapped in half. An unseen force lifts their tent into the sky and the group is separated.
Ashley climbs a tree to recover the drone, but is pushed out and falls to the ground. An unknown entity drags her away. A rainstorm begins. Lisa and James stumble across Rustin Parr's house, despite James stating it had been burned down. James, thinking he hears Heather's screams inside, enters without Lisa. He chases after a teleporting disheveled figure, believing it to be Heather; after it vanishes, he barricades himself.
Lisa, terrified after seeing a tall, pale, long-limbed creature, runs inside the house. A hostile Lane traps her in a tunnel, insisting she listens to what "she" tells her. After Lisa escapes, Lane attacks her and she stabs and kills him. The creature emerges from the tunnel and chases her. She runs to the attic with Lane's camcorder, passing a mirror that shows Heather, revealing the tape found by Lane was being recorded by Lisa, creating a paradox video that lured them all into the woods.
She reunites with James in the attic as a bright light shines from outside the building. James tells Lisa to face the corner, frantically apologizing before something barges into the room. The being tricks James, using Heather's voice to make him turn around, and he vanishes from sight. Lisa realizes looking at the creature will ensure her death, so she uses Lane's camcorder to look behind her. She catches a glimpse of the creature behind her and starts walking backwards. The creature uses James' voice, stating, "Lisa, I'm so sorry", and Lisa turns, immediately getting snatched away. Her camcorder falls to the ground and gives out.