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Whilst clearing out her mother's belongings from her care home, Kelly discovers a hidden family secret. Her grandfather was Dr John Watson. As she digs further, Kelly uncovers the truth of the untold final case of Sherlock Holmes: a case involving an otherworldly crown of mysterious origin, and the abandoned American coastal town of Innsmouth.
This is an archived listing from the 2026 Edinburgh Festival Fringe. Sherlock Holmes: The Adventure of the Innsmouth Crown is by Innsmouth Crown Productions, listed under Theatre in the Fringe programme. It plays at theSpace @ Surgeons' Hall, Surgeons Quarter, Nicolson Street, EH8 9DW, 24 August to 29 August.
The show runs 50 minutes and is suitable for ages 16+. Tickets are £15. Content warnings: Distressing or triggering themes.