The Ghost at Massingham Mansions

In his stories of detection, Bramah hit on the idea of a blind detective, Max Carrados, whose triumphs are all the more amazing because of his disability.
In this story, Max Carrados is called in to investigate a mysterious ghost which haunts an empty flat in Massingham Mansions in London. Every night gastlights are seen in the apartment, even though the gas has been disconnected. Also water runs in the bath every night, even though the water supply has been turned off. Carrados quickly realises that the detectives on the case are barking up the wrong tree....