National Gallery of Painting: After the Theft

Where can I find a cab at this time of day?

How do I open the crate by the main entrance?
Can I get any information from the blue footprints?
How can I link the footprints to a suspect?
Are there any clues near the stolen painting's former location?

Which is the first painting Lupin refers to in his note?
Which is the second painting Lupin refers to in his note?
Which is the third painting Lupin refers to in his note?
Which is the fourth painting Lupin refers to in his note?
What should I do with the four numbers found in Lupin's poem?

Where is the portrait of Velmont mentioned in the clue in the crate?
How can I uncover the real message in Velmont's self-portrait?

Lupin's Lettered Clues
I have solved all the clues, what should I do next?
Holmes' Quiz 3: What word did Sherlock Holmes find?
How can I pinpoint the location of the next theft?

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