LONDON -- The Watch Secret Sessions Onlineinternet loves a good mystery, and that goes double when it's a Harry Potter-themed one.

On Wednesday afternoon, Pottermore-- the official website for all things Potter-related -- tweeted the following image.

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Intriguing, but what does it mean?

Well luckily, excited Harry Potter fans make excellent online sleuths.

First, people played around with the contrast.

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The picture appeared to show a darkened shot of a dimly lit forest -- but what was it all about?

Some thought the trees might be to do with Fantastic Beasts and Where to Find Them.

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Others suggested the image might relate to a much-anticipated Patronus Test.

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And others simply tried to use magic to find the answer.

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As the afternoon progressed, Pottermore tweeted more images.

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The Patronus Test began to look like a real possibility.

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There were also video clips.

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By Thursday morning, things were becoming clearer.

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At the time of writing, this is Pottermore's most recent clue.

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If that isn't a silver stag Patronus about to form, we don't know what is.

It looks as thought we may soon have an official Patronus Test, people.