Three young women from very different backgrounds meet, become friends and share experiences when they all gain positions as nannies in the wealthy households of London's exclusive Berkeley Square.

After a childhood of abuse by his evangelistic father, misfit Oscar Hopkins becomes an Anglican minister and develops a divine obsession with gambling. Lucinda Leplastrier is a rich Australian heiress shopping in London for materials for her newly acquired glass factory back home. Deciding to travel to Australia as a missionary, Oscar meets Lucinda aboard ship, and a mutual obsession blossoms. They make a wager that will alter each of their destinies.