Living with the world's only consulting detective, John Watson didn't think his life could really become more interesting. One September day, he is proven wrong by a man called the Doctor. The Doctor takes John and his colleague, Sherlock Holmes, to a strangely familiar planet full of danger, mystery, and a few enemies. It's up to Sherlock to help John and the Doctor through the twisting corridors of this mind palace, but can he open up enough to this stranger to help in time? John finds that his friend's mind might be of a greater danger than he'd originally thought, but only when he's forced to escape from it, racing through the halls of the mind palace.