David Walliams's best-selling children's book Gangsta Granny is to be brought to life as a Christmas family drama for the BBC.
The tale follows last year's seasonal special when another of his novels, Mr Stink, was adapted starring Hugh Bonneville as a kindly tramp.
Walliams will work on the script along with Kevin Cecil and Andy Riley who have previously worked on Gnomeo and Juliet and Robbie The Reindeer.
The hour-long BBC1 film, which has yet to be cast, revolves around schoolboy Ben who is bored at his grandmother's house until he learns she was formerly an international jewel thief and has been plotting to steal the crown jewels.
The story was first published in 2011 and is still number one in the children's book chart.
Walliams said: "Gangsta Granny has proved to be the most popular of all my books.
"It is an adventure story about two unlikely thieves, Granny and her grandson Ben. It should make for exciting family viewing at Christmas."
The book has sold more than 430,000 copies and is Little Britain star Walliams's fourth kids' novel following The Boy In The Dress, Billionaire Boy and Mr Stink.
Shane Allen, the BBC's controller of comedy commissioning, said: "The story delivers on David's penchant for being outrageously funny but yet poignant and tender as well. This will be a wonderful family viewing treat for this Christmas and we're thrilled about seeing it make the journey from page to screen".
Walliams is also working on a BBC1 sitcom Big School which also stars Catherine Tate.