One night in 1986 an abandoned baby girl is found in a cleaning cupboard at Heathrow airport A year earlier, three girls, Martha, Clio and Jocasta had met by chance, at the start of a backpacking adventure It would be a long time until they met again when Kate, the foundling, is a teenager, and the three women are all leading successful lives Which of them is Kate's mother? Why was she desperate enough to do such a thing, and how did she survive it?