sentences:  Written by Basil Dawson, this four-part story involving murders in Victorian London.Dawson, a veteran screenwriter, was approached by script editor Robert Holmes to develop a story which would introduce a new companion to replace Sarah Jane Smith following her departure.The new character was to be a Cockney girl whom the Doctor would take under his wing and educate, in the manner of Eliza Doolittle in the George Bernard Shaw play "Pygmalion".