Butler suddenly noticed his three-year-old sister was cheerily drawing all over herself with biro. "Juliet," he said slowly, "what are you doing?"

She beamed. "Drawing!"

"I can see that. Why are you drawing on yourself?"

“Because then I'll be like you!”

Butler realised then that she was drawing little blue diamonds. He wondered at her childish adoration for the very thing that would take away her innocence. You don't want to be like me, he thought. But he said nothing. She wouldn't understand yet.

"Come on," he said, taking her hand, "let's wash this off before Mummy sees."