Saturday, ABC, 7.30pm The set-up involving a crime-solving Catholic priest might seem novel to some and they’d be right. This quirky British series is based on the detective novels by G. K. Chesterton, which first hit the shelves in 1911. The character of Father Brown (played by Mark Williams, also known as Arthur r Weasley from the Harry Potter films) remains largely the same, but the circumstances and stories have been created to suit today’s less stuffy sensibilities. es. Tonight, Father Brown takes it upon himself to investigate after an old friend disappears.