The fourth series promises to raise the bar ever higher, with Britain' foremost acting talent clamouring for roles. Always aiming to surprise, delight, unnerve and amuse in equal measure, the anthology format continues combining a different mix of horror, thriller, drama and comedy. New settings will include a country farmhouse, a mysterious photographic darkroom, and the entire ninth floor of a luxury hotel. And even the doors of some very ordinary-seeming houses can conceal some of the best and most intriguing stories, because Inside Number Nine you can find anything, anything at all.