Syed, who was convicted of the 1999 murder of Woodlawn High School senior Hae Min Lee, his former girlfriend, has been imprisoned in Maryland ever since.
"Serial," Koenig's podcast about the case, became a pop-culture sensation as the most down-loaded podcast in history.
This month, a Baltimore judge granted a motion to reopen post-conviction proceedings, which will allow new evidence to be introduced on behalf of Syed.
Chaudry, a Maryland lawyer, started her own podcast, "Undisclosed," once "Serial" ended. (Read my interview with Chaudry and a review of her podcast here.)
The book, which is scheduled for publication in September, 2016, by St. Martin's Press, is titled "Adnan’s Story: Murder, Justice, and the Case That Captivated a Nation."
"I'd like to add that the book will also include parts of the investigation never aired on our podcast, 'Undisclosed,' which now has 50 million listens," Rabia wrote in an email to The Sun today confirming the book deal, which was first reported by "Entertainment Weekly."