Sir Ian McKellen is due to star as an elderly Sherlock Holmes in the movie adaptation of 'A Slight Trick of the Mind', a 2005 novel by Mitch Cullin.

'The Hobbit' star has been signed on to portray the world famous sleuth which is set to be directed by Bill Condon, who he previously worked on in Oscar winning 1998 biography drama 'Gods and Monsters', with a screenplay by Jeffrey Hatcher.

The Holmes film is about the detective as an old man, partially crippled and only able to walk with a cane, and with an increasingly poor memory. He must crack a case that has stumped him for 50 years before his almighty mind finally fails him.

Continue reading: Ian McKellen Goes From Sorcerer To Sleuth In Upcoming Sherlock Movie