The last time that anyone heard from 35-year-old Claudia Lawrence, a chef at the University of York, was when she sent a text message to a friend on 18 March 2009 at 8.23 p.m. She has never been heard from or seen again, and her disappearance is a mystery that endures to this day. What happened to Claudia that early spring evening - or was it early the following morning on her way to work? There had been nothing abnormal about her behaviour before she vanished, and there were no signs of a struggle at her home. A Crimewatch reconstruction has been broadcast, and the police investigation into the case has cost more than £750,000. Dozens of interviews have thrown up numerous leads, but there are no concrete clues. With extensive access to her family and friends, in Gone , Neil Root assesses the facts and theories and asks: where is Claudia?.