Sherlock creator Mark Gatiss' new detective drama can only get better as it develops — and it has the potential to continue for a very long time. One of the UK's most successful actors and writers working today, Mark Gatiss has lent his writing talents to several major internationally renowned shows, including the BBC's Sherlock, Doctor Who, and Agatha Christie's Poirot. As a self-professed life-long fan of the murder mystery genre, it was only a matter of time before Gatiss created his own prominent TV detective, and the resulting series has been undeniably successful.