The Unbreakable Alibi

Tommy and Tuppence were busy sorting correspondence. Tuppence gave an exclamation and handed a letter across to Tommy.

“A new client,” she said importantly.

“Ha!” said Tommy. “What do we deduce from this letter, Watson? Nothing much, except the somewhat obvious fact that Mr. ⁠—er⁠—Montgomery Jones is not one of the world’s best spellers, thereby proving that he has been expensively educated.”

“Montgomery Jones?” said Tuppence. “Now what do I know about a Montgomery Jones? Oh, yes, I have got it now. I think Janet St. Vincent mentioned him. His mother was Lady Aileen Montgomery, very crusty and high church, with gold crosses and things, and she married a man called Jones who is immensely rich.”

“In fact