A Surprise Guest
Most people would say that even though Quentin was advanced for his age, but all of them would certainly agree that he was much too young to be wandering in London alone. Quentin disagreed - he was twelve now, thank you very much, and he had business to attend to that was much more important than your inaccurate perspective of what he could do at what point in his lifetime. At any rate, he had to get this done now before he got shipped away to Eton next year and the opportunity was gone entirely.
The street was only a few past the normal tube stop he would use to get to school normally - couldn’t be easier. He let himself into the building and, running through his mind to make sure that he was at the correct place, knocked at the door to Sherlock’s apartment.