Here are some hints, if you are stumped by some of  the puzzles in the diary:

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Puzzle 1

Did you notice the highlighted letters in the text?

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Puzzle 2

The text mentions the line between Henry Rutherford and John Smith.  Look at the first letters of the names on that path:

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Puzzle 3

The destination is blackened on the train ticket. Perhaps if you knew from which track it departed you could figure it out. Have you noticed the fold line on the page?

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Puzzle 4

Look at the patterns formed by the white flowers in the picture. You might recognize these patterns; they represent the Braille alphabet. They are also used to spell out the names of the months on each diary page.