Learn what "have to decipher" means, when people say it, and how to use it naturally in English.

It means they must solve a code first before they can get the diary.
From School Hall, Episode 25
The speaker says they need to decode a code before they can find Pamela's diary.
Use this when talking about solving a hidden message or puzzle. It sounds natural, but the full line is too story-specific for a page.
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