The Seven-Per-Cent Solution (1976)

 

Directed by Herbert Ross. Sherlock Holmes. Alan Arkin, Robert Duvall, Nicol Williamson, Vanessa Redgrave, Lawrence Olivier. I also have this book by Nicholas Meyer. 

https://en.wikipedia.org/wiki/The_Seven-Per-Cent_Solution_(film)

https://crimereads.com/bringing-nicholas-meyers-the-seven-per-cent-solution-to-the-big-screen/ 

https://www.tcm.com/articles/111437/the-seven-per-cent-solution 

https://www.dvdtalk.com/dvdsavant/s4062seve.html