In her spotless top floor flat Stella has created the ultimate cocoon. her life is as perfectly ordered as the phials in her treatment room, where her patients have come to depend on her healing hands, as strictly inventoried as the contents of her rucksack, always ready by the door in case she needs to make a quick getaway. But she never ventures out; everything comes to her. Even men. When Ivan moved in he was told- no stories from the past, no unnecessary anecdotes, no questions. But can Stella keep her own rules? Yellow is the colour of gas, of fear, of jealousy. And Stella has smelt something in the air that she cannot control. Ivan's history, her sister's light-hearted despatches from the outside world, even her cat's fidelity - everything is up for questioning.