I'm a Doctor, not a Detective

The Doctor regenerates from the twelfth into the thirteenth, and looks just like Sherlock Holmes, who is missing, along with fourteen others. The Doctor and Sherlock are confused for each other, but The British Government soon finds out that The Doctor is in fact "the code 9," but Sherlock is still captive as The Doctor. Will The Doctor, UNIT, and Scotland Yard find him in time?