YA author Brittany Cavallaro (pictured) is developing a TV show concept based on her teenlit franchise Charlotte Holmes with actor/filmmaker Kit Williamson (EastSiders), who optioned the rights to the books through his LA-based production banner Go Team Entertainment.

Since A Study in Charlotte launched in 2017, HarperCollins has published three more titles in the Charlotte Holmes series, which has collectively sold around 250,000 copies worldwide. Its premise revolves around two teenagers whose great-great-great-grandfathers happen to be famed sleuths Sherlock Holmes and Dr. Watson. While attending the same boarding school, Charlotte and Jamie navigate a budding romance while teaming up to solve cases ranging from an uncle who goes missing, to the unexplained death of a fellow student.

Cavallaro and Williamson are currently co-writing scripts for the project, which is poised to benefit from the perennial popularity of detective storytelling as evidenced by other upcoming shows like Anisha Accidental Detective (BBC Studios Kids & Family) and The Baker Street Four (Folivari/Blue Spirit).

But Charlotte Holmes is in an especially advantageous position, thanks to its connection to the legacy characters created by Arthur Conan Doyle, whose associated works fully entered the public domain in 2023. This classic British literary canon has been associated with such recent small-screen hits as Netflix’s Enola Holmes movie duology and, more recently, this year’s Sherlock & Daughter live-action series on Discovery+/The CW.