Sam and Dean track down what they think is a shapeshifter. Problem: it's now in London. Bigger problem: two strange but well-meaning gentlemen think they can help. Two strange but well-meaning gentlemen called Sherlock Holmes and Doctor John Watson. For those about to read, I salute you.

Dean and Sam hunt down a demon holding over a thousand contracts to London, though they find out that Sherlock Holmes himself is trying to solve the same case. With this sociopath and his partner, will Dean and Sam be able to finally get this demon? (Slight Johnlock, because it is my being. T for slight swearing and gory stuffs)