The Watchers: The Beginning of Sorrows (2016)

Madeline Tanner's little sister Briana vanished from her bedroom over six months ago. With no viable leads and no evidence, everyone gave up hope - except for Madeline. Convinced of a supernatural cause for her sister's predicament, she continued the search until her own disappearance. Her former best friend Laura Leeds decides to track down Madeline despite the very real risk of suffering the same fate.