On 17 February 1920 a young woman was rescued from a Berlin canal and taken to a local asylum. Her body bore the scars of bullet and bayonet wounds. For a long time she refused to give her name, and was known as Fraulein Unbekannt (Miss Unknown). When she did declare herself - as the Grand Duchess Anastasia, youngest daughter of the murdered Romanovs - she became the centre of a storm of controversy that still continues after her death in 1983. Peter Kurth's brilliant and meticulously researched account shows that the evidence that Anna Anderson was Anastasia is in the end overwhelming. Nevertheless the extraordinary secrecy which still shrouds some of the key evidence suggests that, as her uncle the Grand Duke of Hesse wrote, an investigation of her identity could be 'dangerous'.