A year after the death of his friend and partner Sherlock Holmes at the hands of Moriarty, Dr. John Watson resumes his medical career as the head of a clinic dedicated to treating rare disorders. However, he soon finds that his old life is not done with him yet.
On the night of their anniversary, Natasha and Alex come home to find their power disconnected. The evening begins to unravel, revealing a disturbing undercurrent.
