In the early hours of June 3, 2011, Indiana University sophomore Lauren Spierer was out in Bloomington with friends. She was 20 years old. 4 foot 11. About 90 pounds. By every account, she'd been drinking a lot. Around 2:30 a.m. she walked out of Kilroy's Sports Bar with a young man she'd met. She left behind her cell phone. She left behind her shoes. Over the next two hours, she bounced between apartments in the neighborhood around her building. People saw her. People talked to her. At one point, a man in one of those apartments said she told him she wanted to go home. She was last seen around 4:30 a.m., near the corner of College Avenue and 11th Street. She was barefoot. She had no phone. Her apartment was right around the corner. She never got there. Later that morning, her boyfriend texted her and got no answer. By that afternoon she was reported missing. What followed was one of the biggest searches in Indiana history. Volunteers flooded Bloomington. Her parents moved there to lead the hunt. Landfills were dug through. Every person who saw her that night was questioned. Her family eventually sued several of the young men she was with, hoping to force out the truth. A court threw the case out. No evidence. Police now have nearly 1,000 reports in the file. Last year alone they chased down 23 new tips. They insist this is not a cold case. But 15 years later, Lauren Spierer has never been found. She vanished barefoot, within a block of her own front door, in a college town full of people. Somebody saw something.