“You’re Not Alone” (** out of four) was a tepid suspense potboiler about a security specialist (Michael Jai White) who is aboard a plane coming home when he sees his daughter (Precious Way) is being stalked via the home security system and he’s helpless to do anything at 40,000 feet in the air but tries desperately to contact her and control the situation. Nerve-wracking scenario has elements of “When A Stranger Calls” and also “Red Eye” but never achieves the real suspense and tension that would make it satisfying. Jai White is rock-solid as usual and carries film almost singlehandedly.