It is a novel idea and works well to combine the legends of Sherlock Holmes with those of A Christmas Carol.  Holmes (Ben Caplan) has returned from the death of Moriarty at the Reichenbach Falls and is approached by Dr Timothy Cratchit (Devesh Kishore) to investigate the death of his benefactor.  Dr Cratchit as a child was called “Tiny Tim” and his benefactor was Ebeneezer Scrooge.

We can see some of the similar character traits held by Holmes and the pre-reformation Scrooge: curmudgeonly, solitary, depressive and hating Christmas.  Holmes is also approached by Emma Wiggins (Louise Hoare) to help her father who has been accused of theft and is in prison.  The Wiggins family appear in some of the Sherlock Holmes stories.  The blue carbuncle, a large blue precious stone like a sapphire, features in one of Holmes’ short stories.