It already came out in Australia.

Wait what

It was published to Australia at September 29th, 2020. I have the book so I should know.

Depending where you live it's being released on different dates.

September 29 - Australia/NZ

October 15 - UK

October 27 - US/Canada

You can find more info on the Hollowpox novel page.

I live in America and I pre ordered hollowpox on Amazon two months ago. I just got it in the mail yesterday (Oct 28)