Seven years ago, Kitty and Bella were inseparable, but when Bella suddenly, rather mysteriously, moved away, Kitty thought the friendship was over. Now Bella's back, and she wants the two of them to be best mates again - to be soul sisters. But Kitty wants to know what's happened to Bella in the years in-between, and Bella refuses to talk about it. Then Kitty catches her out, and she begins to think that Bella's life is based on a web of lies, hiding a devastating secret... A compelling story of friendship, jealousy and betrayal.