Where

You will need the photo of the strange writing plus the photo with the key.

The letters in red spell out a word, a key to be used on the cipher. Write this word above the letters abcdefghij to create a key to use.

By taking the word "Trampoline" (from the red letters) and writing it above abcdefghij you create a key to decode the cipher. You won't be able to decode every letter with this but enough to work out the sentence. It reads - "Eager to find the stolen items? They are hidden in the Crypt."