New Delhi, July 28 (ANI): Ian Mckellen recently spoke up on playing ' Sherlock' in the upcoming movie ' A Slight Trick Of My Mind', which is based on the 2005 book by Mitch Cullin. He said that till date, more than 70 actors had the privilege to play the iconic role, but now it was 'his turn', a leading daily reported. The book portrays a 93-year-old version of Holmes, who is eager to solve one last case but without his trusty sidekick Dr Watson.