Holmes and Watson's new careers as consultants for Scotland Yard in London take them inside the tabloid journalism industry when a popular model is the victim of an acid attack. Also, as Watson grows increasingly homesick for New York, Captain Gregson is wracked with guilt over his unresolved rift with his former consultants.

Holmes takes extreme measures to secure his return to New York when he leans on his father's disreputable connections to aid his legal re-entry into the United States. Also, while Holmes looks for a way back to the United States, Watson helps the NYPD investigate a murder at a storage facility that caters to wealthy clients with items they want hidden from U.S. Customs.