When Agatha Christie, the so-called 'Queen of Crime', disappeared from her home in Sunningdale in Berkshire for eleven days on 3 December 1927, the whole nation held its breath. The following day, when her car was found abandoned fourteen miles away, a nationwide search was instigated. From a painstaking reconstruction of Agatha's movements and behaviour during those eleven days, Dr Andrew Norman is able to shed new light on what, in many ways, has remained a baffling mystery. Only now, fifty years after Agatha's death, is it possible to explain fully, in the light of scientific knowledge, her behaviour during that troubled time. By deciphering clues from her celebrated works, "Agatha Christie: The Finished Portrait" sheds light on what is perhaps the greatest mystery of all to be associated with Britain's best-loved crime writer, namely that of the person herself.