Whilst questioning a suspect in his latest case, Sherlock Holmes has a feeling that the man has poisoned his cup of tea. Holmes asks him to make him a fresh cup. Taking a sip, he says, "You brought me back the same cup!"
How did Holmes know?
~~~
Answer to previous riddle: Mark Brown. "?" = question mark, so the note reads: "Question Mark Brown. He is the murderer."

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Riddles | Sherlock Holmes
Mystery / ThrillerThe Case of the Curious Conundrums | A tricky test of lateral thinking Could your lateral thinking skills rival those of the master of elementary, Sherlock Holmes himself? Put your brain through its pages with this curated collection of riddles and...