What happens when the HP world meets the classic world of Sherlock Holmes? An evil group called Slytherins stalks London, drawing the attention of super sleuth Harry Potter. With trusted friend Ron Weasley, he sets out to solve a case bringing him directly in the path of the one person who bested him, intrigingly intelligent Hermione Granger. Then arch nemesis Lord Voldemort becomes connected to the case, pushing Harry to his limits. Can he find a way to stop the one man who had the ability to equally match wits with the master detective?