Every weekday night the greying and tired janitor shoves his cart through the endless corridors of the deserted office building. The front right wheel is almost stuck and causes a weird wobble. Arrived at the end of the gloomy corridor he soaks the mop in the dirt-grey water and starts mopping. One of the overhead neon lights buzzes and flickers, throwing moving shadows against the wall. With a sigh he leans his mop against the wall. For the first time he notices that the end of the stick looks like a cap. With a jarring twist he manages to unscrew the orange cap uncovering a hollow stick. Like a message in a bottle, a tiny rolled up piece of parchment appears to be stuck in the broomstick. All this time, the answer had been quietly resting inside the belly of the broomstick. With a final flicker, the neon light illuminates for the last time a mop lying next to an abandoned cart in an empty corridor.