In 1986, an abandoned baby girl is found at Heathrow Airport. A year earlier, three girls had met on a backpacking holiday. By the time the foundling, Kate, is a teenager, the three have achieved success, one as a corporate lawyer, one as a doctor, and one as a tabloid reporter. Which is Kate's mother? One night in 1986 an abandoned baby girl is found in a cleaning cupboard at Heathrow airport. As a teenager Kate, the foundling, is desperate to find her birth mother, even though she was adopted by a loving family. Gradually the lives of Kate and three girls Martha, Clio and Jocasta who were backpackers together a year before Kate was found abandoned, are intertwined.