Leave it to an award-winning documentary filmmaker to do found-footage chills right. A perfectly calculated, slow-burn nightmare that opens with the feel of an indie doc and gradually evolves into something uniquely sinister, “In Our Blood” is the narrative feature debut of Oscar-nominated documentarian Pedro Kos (“Rebel Hearts,” “Lead Me Home”). Nothing is as it seems when filmmaker Emily Wyland (a phenomenal Brittany O’Grady of HBO’s “White Lotus”) teams up with cinematographer Danny (E. J. Bonilla, FX’s “The Old Man”) to shoot an intimate documentary about reuniting with her mother (Alanna Ubach, HBO’s “Euphoria”) after a decade apart. When her mother suddenly goes missing, Emily and Danny must piece together increasingly disturbing clues, hoping to find her before it’s too late. Sad, scary, and unshakably convincing, this is a film that lingers like the ghosts of stolen futures.