It's Genetics. Unfortunately by Lisgreomg

It's Genetics. Unfortunately by Lisgreomg Merlin Holmes, the youngest Holmes brother, reaches out to Sherlock for help finding a friend that has gone missing. This is a Merlin/Sherlock crossover in Sherlock canon time. While it is presented as primarily a Merlin fic due to the pairings I found much of its pleasure was its depiction of John, Sherlock, oh and Mycroft. John and Sherlock, like Arthur and Merlin and the knights are reincarnations or as the author puts it ' souls with a capital-D-Destiny'. However, unlike Merlin and Arthur, they have no memory of their previous lives. All in all it's a very good read.