Do you want to watch Sherlock: The Sign of Three online? Until January 19th you can do it freely in the BBC iPlayer. That is a great chance. In spite of the fact that the program is only available to people in the UK, that is a regulation that can easily be bypassed with a UK IP address.
To find out how to watch Sherlock: The Sign of Three online, please read our main article on how to watch the BBC iPlayer from outside the UK. There you will find all the necessary information you need on the subject and you can find yourself watching Sherlock and other content available at the moment in the BBC iPlayer in a few minutes from now as you follow those instructions.