Martha, Clio, and Jocasta meet by chance at Heathrow Airport in 1985 as they are starting off on separate back-packing adventures, and they decide to spend a few days together in Thailand first. When they go their separate ways, they vow to get together in London the following year. But many years pass before the three cross paths again, and the once capricious, carefree girls now all have thriving careers. One of them, however, harbors a terrible secret: on her return from her pre-college excursion, she left her just-born daughter at Heathrow. Martha is a highly paid corporate lawyer, just embarking on a political career. Dedicated to her job, she has had little time for personal relationships and lives a busy but lonely life. Clio has fulfilled her ambition of becoming a doctor, only to find herself trapped in a marriage to an arrogant surgeon who belittles her and her professional achievements. Jocasta, a reporter on a tabloid newspaper with an infallible instinct for the big story, is in love with a charming colleague who can't make the permanent commitment she longs for. The infant abandoned at Heathrow has grown up under the loving care of her adopted family. Now a beautiful teenager named Kate, she sets out to find her birth mother...a quest that unexpectedly brings the women together and exposes the secret buried so many years before.