Based on Kitty Aldridge's debut novel, Harris wrote the adaptation with the author. Their script has been optioned by Andrew Karsch, who will produce the project with Simon Bosanquet of Generator Pictures.
Pop is the tale of a 13-year-old girl who goes to live with her widowed grandfather and his dog after her mother dies. The tragicomic coming-of-age story is set in a Birmingham suburb during the long hot summer of 1975.
'It's about how he helps her through the trauma of her mother dying,' says Harris. 'It's about that time in England when there was shift with the Queen Elizabeth's Jubilee happening but the advent of punk was just around the corner. The country was becoming something different.'
With Stewart now in place in the role of the pub-quiz loving grandfather, casting will get underway soon for the teenage girl with the intention to find an unknown. The role of the mother is shown in flashbacks. Harris is aiming to begin shooting in the UK at the end of this year, after Stewart finishes the Broadway run of Macbeth followed by the role of Claudius in the RSC production of Hamlet.