When Dr Kobi Voight is given a set of old letters by his mother he has no inkling that they will lead him around the world and deep into the tragic past of his family. Within the letters—written in Hebrew and filled with delicate illustrations—lie the reflections of a young Jewish woman, forced to give up her baby daughter while fighting with the Resistance in Berlin. Who is the author, known only as 'Ruby', and what became of her child? And how does a priceless work of art, stolen by the Nazis, form part of the unfolding mystery? As he explores Berlin and visits its war memorials and museums, an astonished Kobi begins to realise he is part of the story, too. From the Holocaust to the present day, across continents and oceans, Kobi's journey will ultimately lead him to the truth about his family's past—and his own identity.