I'm pretty sure "誰にも読めない本" is correct. However, I have also heard something in
the same vein as "誰も読めない本", without the に. Is this also correct?  
If so, does も replace が here?
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2019-04-07T19:07:41.713
66483
2022-05-02T23:48:54.530
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question
grammar particle-に particle-も potential-form
誰も + potential verb form
> 誰も読めない本, without the に. Is this also correct?

Yes, it is correct in this case.

> If so, does も replace が here?

No, it cannot be replaced. 誰も読めない本 is correct. 誰が読めない本 is incorrect. Japanese
people never say it like this.
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2019-04-08T02:26:23.440
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2022-05-02T23:48:54.530
2022-05-02T23:48:54.530
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answer