The amazing story of John Haydon and his American half-sister Diane Messer, who found each other recently after a lifetime apart. John's mother Eileen walked out on him and his father when John was still a young boy - and went on to live an extraordinary and colourful life of adventure. Via Paris, Africa and New York, Eileen ended up in New Orleans, where she married and had a daughter, Diane. 58 years later, Diane and John have finally found each other - and this emotional transatlantic reunion has an extraordinary twist, when a necklace Diane had been given by her late mother turns out to have a huge and unexpected significance...