Answers for the London Bonus Questions
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What did Charlie Chan in London, Paris, and Reno have in common?
Charlie tells the investigating officers at these crimes that if you want a wild bird to sing, do not put him in a cage.
What did London have to do with Olympics?
Both involved airplane inventions.
What did London have in common with Monte Carlo?
Both Lake, the groom, and Al Rogers, the Monte Carlo bartender, were killed in their rooms that looked like boxes. Both were murders made to look like suicides.