What is the importance of the "Lying Game" in the book, The Lying Game: A Novel?

The Lying Game is a symbol of the attitudes of Thea, Isa, Fatima, and Kate regarding the value of honesty. It is the basis of Isa's relationship with Kate, Fatima, and Thea. She believes the game influenced the rest of her life and how she acts and interacts with everyone else.