Lestrade and Gregson glanced at each other with an incredulous smile.
“If this man was murdered, how was it done?” asked the former.
“Poison,” said Sherlock Holmes curtly, and strode off.
“One other thing, Lestrade,” he added, turning round at the door: “ Rache , is the German for ‘revenge’; so don’t lose your time looking for Miss Rachel.”
With which Parthian shot he walked away, leaving the two rivals open-mouthed behind him.