"An envious mask hid cheeks and brow"
"How did you know me?" he asked.
"By your chin," she replied. "You can never hide yourself behind a mask that doesn't cover that."
The Burglar touched his chin with one gloved hand.
"I forgot that," he remarked ruefully.
"Hadn't you seen me?"
"No."
The Girl drew nearer and laid one hand lightly on his arm; her voice dropped mysteriously.
"Is everything ready?" she asked.