Tato série sleduje obyčejného policistu z Oxfordu, který se nečekaně ocitá vtažen do tajné války proti hrozivým entitám z jiných dimenzí. S každým případem se musí postavit nadpřirozeným silám, které ohrožují samotnou realitu, přestože se sám považuje za naprostého hrdinu. Jeho cesta je plná nebezpečí, humoru a otázek o odvaze a hranicích lidských možností. Jedná se o poutavou směsici městské fantasy, akčního thrilleru a kosmického hororu.
Oxford police detective Arthur Wallace is a good cop, but prefers that action and heroics remain on the screen, safely performed by professionals. But then secretive government agency MI12 comes calling, hoping to recruit Arthur in their struggle against the tentacled horrors from another dimension known as the Progeny.
Another day, another zombie T-Rex to put down. All part of the routine for Arthur Wallace and MI37 - the government department devoted to defending Britain from threats magical, supernatural, extraterrestrial, and generally odd. But a zombie T-Rex is only the first of Arthur's problems, as Russian cyborg wizards threaten his life...
When MI317 - the government department devoted to defending Britain from cosmic horrors and otherwordly threats - comes under attack, Arthur Wallace and his team begin a race from Area 51 to an Arctic town populated entirely by spore zombies to save the world and halt the destruction of humanity.
Arthur Wallace and the MI37 team confront their personal relationships as well as robots created to aid the Nazi's invasion of Russia, leading to a trip for the team to the Himalayas, which takes them to a Nepalese death cult, then back to London for the final assault - amidst assorted relationship break-ups, hangovers and pregnancy scares.