Video: Book launched in hunt for Claudia

It's almost four years to the day that Claudia Lawrence went missing from her home in York - and despite an investigation costing hundreds of thousands of pounds, police appear to be no closer to solving the mystery than they were back then.

What began as a missing person's inquiry then became a murder hunt. Claudia's family have made numerous appeals for help - all of them to no avail. Now a new book - titled Gone - examines what might of happened - and details the incredible strains her loved ones have faced.