This is a Sherlock Holmes science fiction type thing. The pre-text is:

The Displaced Detective Series is a science fiction mystery series in which the brilliant hyperspatial physicist, Dr. Skye Chadwick, discovers that there are alternate realities, and said alternates are often populated by those we consider only literary characters. Her pet research, Project: Tesseract, hidden deep under Schriever AFB, is her means of looking in on these continua. In one particular reality, continuum 114, a certain Victorian detective (who, in fact, exists in several continua) was to have died along with his arch-nemesis at the Reichenbach Falls. Knee-jerking, Skye intervenes, rescuing her hero Sherlock Holmes, who inadvertently flies through the tesseract wormhole connecting his universe with ours, while his enemy Professor Moriarty plunges to his death. Unable to send Holmes back without causing devastating continuum collapse due to non-uniqueness, he must stay in our world and learn to adapt to the 21st century.

http://www.examiner.com/article/is-sherlock-sexy-stephanie-osborn-s-the-displaced-detective-returns