On the surface they are as opposite as two people can be: Kate, doomed to be forever uncool, with a loving family who mortifies her at every turn; Tully, steeped in glamour and mystery, but with a secret that is destroying her. For thirty years, Tully and Kate buoy each other through life, weathering the storms of friendship - jealousy, anger, hurt, resentment. They think theyve survived it all until a single act of betrayal tears them apart and puts their courage and friendship to the ultimate test.