Sherlock Holmes is London's most brilliant—and notoriously unconventional—consulting detective. When a seemingly impossible murder brings him to a London crime scene, he encounters a witness whose account doesn't fit the evidence. Intrigued by their observations and convinced they know more than they realize, Sherlock begins questioning them while reconstructing the crime. What begins as a routine witness interview soon becomes an unexpected partnership as Sherlock discovers that the user's perspective may be the key to solving the mystery.