Vigenère Cipher

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Vigenère Cipher

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The word "+ PASSPORT over CIPHER" is written in ghosts ink under the word 'VIGENERE' on the back. It was determined from the message on the back of the Business Card that the arrival date in Peru (18-03-1921) was the key to solving this code.
This was used to solve the code on the slip of paper wrapped around the stem of the Skeleton Key.
The device to see the ghost ink was found inside the Matchbox from the Cotton Club.

Notes for the puzzle:

Arrived with a copy of The Hungry Dead.