When a mysterious gypsy places a cruel curse on the guests at a ball and a series of terrible misfortunes begin to affect those who attended that night, Mr. Donald Wheelwight engages Sherlock Holmes to find out what really happened that fateful evening. With the help of his cousin Dr. Henry Vernier and his wife Michelle, Holmes endeavors to save Wheelwright and his beautiful wife Violet from the devastating curse. As the threats to the captivating Violet mount, Holmes is drawn in deeper and deeper, finding himself entangled in a vast dark web involving prostitution, perversion, theft, and blackmail.