A detective asked Hannah’s mother, Barbara Bellus, to come to the Thirtieth Precinct, in Harlem, to view the Apple Store surveillance footage. Barbara watched a woman wearing a sports bra and running shorts, her brown hair pulled into a high ponytail, ascend the staircase in the store. A man stopped her and asked if she was the missing teacher in the news. Barbara said, “I could see her blow off what he was saying, and I knew instantly it was her—it was all her. She has this characteristic gesture. It’s, like, ‘Oh, no, no, don’t you worry. You know me, I’m fine.’ ” Another camera had captured Hannah using one of the store’s laptops to log in to her Gmail account. She looked at the screen for a second before walking away.