He grinned back and then—very suddenly—stopped smiling. He patted his coat pockets, once, twice, then checked his waistcoat pocket, his trousers. His face turned carefully blank. “Is there some sort of problem?” Violet asked. “Let’s play a game,” Sebastian said. His voice was a little too calm, his tone too measured. “It’s a guessing game called—did Sebastian remember to bring the return tickets?”