7. ‘Mr. Holmes’ (2015) Ian McKellen stars as a retired Sherlock Holmes in this quiet drama. Set in 1947, the 93-year-old detective struggles with memory loss while revisiting his final case.

Holmes’ ardent followers know he has zero interest in women – save for The Woman, i.e. Irene Adler – but the serialized nature of Doyle’s mysteries makes it an easy launch for spinoffs.

The second season of “Sherlock & Daughter,” which is in competition this week at the Monte-Carlo Television Festival and is on the CW and Max in the U.S., still awaits greenlight, but not for ...