The series is set to premiere on The CW and Discovery+ on April 16, 2025. It will be broadcast by The CW in the US, whilst Discovery+ will air the series in the UK and Ireland. The series was announced in February 2024, along with the casting of David Thewlis, Blu Hunt and Douglas Scott. Aidan McArdle has been cast in an undisclosed role.
Sherlock Holmes is working on a case when an American girl whose mother has been murdered claims to be his daughter.