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When Sherlock Holmes faces and uncrackable case, he prays. He has never prayed in his entire life, but now it seems more eminent to solve this murder. The Doctor just dropped off his rightful companions (couple), Ali and Matt, in their flat in London. The address is 223b, right across form Sherlock and his flatmate, John Watson. When the Doctor answers the clever Sherlock's prayer, all hell breaks loose as he rejects The Doctor's help in this funny-yet-serious crossover full of Deception and, of course, Deduction.