A mystery woman was filmed by a security camera in shackles, desperately ringing doorbells in a Texas neighborhood in the middle of the night. Now police are trying to identify the woman and determine whether her life is at risk. From analyzing the video, authorities say she might have restraints on her wrist. She also seemed to be wearing only a T-shirt and is barefoot. Inside Edition’s security expert has tips on what you should do if someone rings your doorbell in the middle of the night.