source: http://artsbeat.blogs.nytimes.com/2013/12/27/sherlock-holmes-is-in-the-public-domain-american-judge-rules/?_r=0

In the more than 125 years since he first appeared, Sherlock Holmes has
popped up everywhere from fan fiction set in outer space to screen
adaptations like CBS’s “Elementary,” set in contemporary Manhattan. But
now, following a legal ruling, the deerstalker-wearing detective is
headed to another destination: the public domain.

English: Statue of Sherlock Holmes in Edinburgh
English: Statue of Sherlock Holmes in Edinburgh (Photo credit: Wikipedia)

The Conan Doyle estate  has 30 days to contest the ruling, but I doubt that they will.  For all of you budding authors who have a Holmesian story begging to be released, go for it.