Sian Reese-Williams, a Welsh actress born on November 18, 1981, is best known for portraying Detective Cadi John in the BBC detective series “Hidden” (also known as “Craith” in Welsh) Fluent in Welsh, Reese-Williams began acting in 2004. After graduating from the Royal Welsh College of Music & Drama, she landed roles in various British television shows, including “Emmerdale” (2008-2013), “Hinterland” (2016), and “Line of Duty” (2019 onwards). Her critically acclaimed performance in the play “Lungs” earned her a 2016 Manchester Theatre Award. In addition to television and theater, Reese-Williams has acted in films like “The Light in the Hall” (2022) and the recent BBC drama “Wolf” (2023).