Author Josh Malerman - who wrote the 2014 post-apocalyptic novel - said he was inspired to pen the next chapter after seeing Netflix's adaptation.
"At the end of the movie, I turned to my girl Allison and said, 'I want to know what happens next!'" Malerman told Esquire.
"She’s like, 'Well, you know, you could make that happen', so it really was this warm feeling," he said.
Netflix's Bird Box stars Sandra Bullock as Malorie, a woman struggling to survive with her two children after most of the world's population is decimated by an unknown force that causes people to take their own lives when they see it.
In the film, the characters must go about their lives as best they could, all the while wearing blindfolds to protect them from ever laying eyes on the monsters.
It inspired the 'Bird Box Challenge', in which people would attempt everyday tasks while blindfolded, before posting them online.
Netflix even posted a warning not to partake in the challenge.
'They’re trying to make things work'
The new book takes place eight years after the events of the first, and will simply be titled, Malorie. It will be published on October 1.
"It’s not like it opens with them in paradise," said Malerman on the new book's location, saying that it will be similar to the first "in that they’re trying to make things work."
The book will allow readers to "get to know both Malorie and the creatures better", but despite calls from fans, it won't focus on Boy and Girl, the story's young characters.
"In the time between Bird Box coming out and the time since I’ve been writing Malorie, I’ve been asked a ton of times - what happened with Boy and Girl?" Said Malerman.
"As much as I care about Boy and Girl, this isn’t their story. The Bird Box world is Malorie’s story and I wanted to know more about her. I wanted to get to know her even better."