On Skaro we have a tradition called "stairs" - devices constructed by those wishing to make tired old jokes at our expense. Naturally, these wits, wags and funsters soon meet with the sharp end of our exterminating ray guns of death but the point they raise is both valid and not invalid. Mr Mann has a burning desire to exterminate on more than one storey and has decided to pay a visit to something called a "shoppe"...