A couple years have passed since their first meeting, and now Sherlock Holmes and Irene Adler meet somewhere in Bulgaria. However, at the very beginning of the night, none of them expects they will end up locked in a cell together.

Couple months ago Sherlock Holmes faked his own death in order to save his friends and left London to find and eliminate Moriarty's network. During his chase he stops in Budapest to solve a random case and is surprised by the person from his past. But is their meeting a complete coincidence, or is there a reason for waking up the ghosts of the past?