In the early 2030s, an event named The Fall shook London and introduced humanity to Vornovians, extraterrestrial beings from Proxima Centauri. What began as a misunderstanding escalated into a human-Vornovian conflict, resolved after 18 months through diplomacy, allowing coexistence and collaboration. Peace has endured for two decades, with Vornovians becoming integral parts of Earth's society.
Sherr-Lok, a detective with unconventional methods, aids the Doyle District Detective Bureau and offers private investigative services. Watt-Sun, once a frontline soldier, battled a decade of homelessness and PTSD before Sherr-Lok mentored him into becoming a detective.
Sherr-Lok and Watt-Sun's next journey sees them navigate a mysterious case involving Peter Baskerville, heir to the infamous Baskerville Hall, just mere months after the death of his uncle. Threats against Peter's life provide the backdrop for a captivating narrative filled with escaped prisoners, shadowy organisations, and a supposed curse that has lasted over 200 years. Sherr-Lok and Watt-Sun take the case and find themselves in a fight to find the truth behind the long-running mystery.