This feature-length documentary tells the astonishing true story of three men - Robert Shafran, Edward Galland and David Kellman - who make the chance discovery, at the age of 19, that they are identical triplets, who were separated at birth and adopted by three different sets of parents within a 100-mile radius of each other in New York State. The trio's joyous reunion catapults them to fame: they became instant media sensations, open up an A-list New York restaurant and even appear in a movie with Madonna. But the brothers' discovery also sets in motion a chain of events that unearths an extraordinary and disturbing secret that goes far beyond their own lives: a secret that might one day answer key questions at the heart of all human behaviour.