It was an horrendous tragedy when two teenagers were killed on a level crossing by a Stansted Express train. Charlie Thompson and Olivia Bazlington were on their way to do some Christmas shopping when it happened in December 2005. We all find different ways to deal with grief. A month after the accident, Charlie's dad, Reg, began writing to his daughter. It became, according to him,an obsession and those letters are released as a book.