The book quickly became a huge success, becoming a record-breaking Sunday Times Number One Bestseller, while Osman has been praised for the story and characters too.
In an interview with Eamonn Holmes and Ruth Langsford on Friday's (November 20) episode of This Morning, Osman opened up about Spielberg snapping up the movie rights, and added that Spielberg's offer to create a movie based on his book was a huge confidence booster.
"I thought no one wants a TV presenter to write a book, but I thought people in England might just buy it anyway," Osman explained.
"And the fact that Spielberg was then on the phone... Spielberg doesn't watch Pointless Celebrities, I don't know if that's news to anybody. He's not a huge Richard Osman's House of Games fan.
"So the fact that he read the book and thought that this is a great story, these are great characters, I want to make this a movie, it gave me real confidence that this is an actual proper book and not just some book written by a TV presenter," he added.
The Thursday Murder Club is set in a quiet retirement village and follows the lives of four friends who meet up weekly to investigate unsolved murders. When a serious killing takes place near them, they find themselves unravelling their first live case.
Osman also spoke about people why his characters are in their 70s, saying that older people are often overlooked and his characters use this to their advantage to get away with a lot of things.
"Quite often we think of people in their 70s maybe as harmless, which we all know they're not, they sort of get away with anything they want to," Osman reflected.
"They can inveigle themselves into various spaces and start questioning subjects... It's because, I think people in their 70s are often overlooked, and these people take advantage of it.
"They're brilliant, they're smart, they're funny and everybody overlooks them."
This Morning airs on weekdays at 10am on ITV. The Thursday Murder Club is available to buy now.
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