Technically, the good news would be that some ponies are starting to pay their library late fees. The bad is that they're paying with whatever was available, and that means Twilight has been steadily amassing a collection of unusable funds. Money which could never be spent in Equestria -- but at least it's money she can identify.

But now there's a new coin: something which doesn't seem to belong to any nation. It's a mystery -- and what are mysteries for, if not to be solved?

...well, yes: 'abject humiliation' would be the expected answer. But let her figure that one out on her own.

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