The solution to the mystery when it comes (a good deal earlier than the film intends) doesn't stand up to a quick credit-roll dissection but otherwise this thriller, told entirely via computer and phone screen activity, about a father scouring online social media accounts to find his missing teenaged daughter, is entertaining in the way it cleverly justifies the constant presence of a camera to capture events no matter where any of the characters are and no matter what they are doing, and the wobbly mystery is easily overlooked thanks to a moving opening sequence, a brisk pace, and the very likeable John Cho's performance as desperate dad.
★★★☆☆
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