 The London Underground is in a pitiful state. Deferred maintenance has taken its toll: signs don t light, trash blows about, voices over the public address system are muffled and garbled, service is abysmal. Could it be the fault of a mouse on one of the lines? A shadowy man, armed with long thin hollow tubes and a slice of cheese, may think so: he s on the hunt for a mouse on the Central Line. What has he up his sleeve?