Before Sherlock & Poirot, Another Detective Starred In One Of The Best Prequel Series Of All Time

Years before Prime Video's Young Sherlock and the BBC and BritBox's upcoming Hercule Poirot prequel series, ITV produced one of the best detective-centric prequel shows of all time. For characters as famous and well-established as Arthur Conan Doyle's Holmes and Agatha Christie's Poirot, watching them as their younger selves can allow audiences to see a different side of them. How did Sherlock Holmes come to be such an arrogant, chaotic force of nature? How did Poirot establish himself as the ultimate gentlemanly detective?