“Good God!” groaned Tommy. “Have I joined the Wembley fire brigade?”
“Guess again,” said Tuppence. “You haven’t caught the idea yet. Use your little grey cells, mon ami . Scintillate, Watson. Be a bull that has been more than ten minutes in the arena.”
“Wait a minute,” said Tommy. “I begin to see. There is a dark purpose in this. What are you going to wear, Tuppence?”
“An old suit of your clothes, an American hat and some horn spectacles.”
“Crude,” said Tommy. “But I catch the idea. McCarty incog. And I am Riordan.”
“That’s it. I thought we ought to practise American detective methods as well as English ones. Just for once I am going to be the star, and you will be the humble assistant.”
“Don’t forget,” said Tommy warningly, “that it’s