Waiting patiently for Benedict Cumberbatch and Martin Freeman to return as Holmes and Watson in "" isn't easy for fans.
The Victorian-themed TV special airs January 1, 2016, in the US and UK, and in select theaters worldwide, but that's too long for some of us Sherlockians and Cumberbatch addicts to wait; especially since season 4 of "Sherlock" won't even start shooting next spring.
But now thanks to "Sherlock: The Mind Palace: The Official Coloring Book" by Mike Collins, not only do we get to find hidden clues, but we can color them in to our own curious heart's desire.
The official BBC coloring book retails for £9.99 in the UK, $15 in the US and AU$24.99 in Australia.
Be forewarned, if you have not caught up with all three seasons of "Sherlock" there might be a few spoilers in the rest of this article.
The coloring book from Ebury Publishing and BBC Books features intricate drawings of Sherlock Holmes, Dr. Watson, Mycroft Holmes, Molly Hooper, Mary Morstan and other characters. The book also includes memorable scenes from the series, including Molly offering Sherlock her expertise in the lab, John and Mary's wedding, and even Sherlock's suicidal fall.
A vital clue from each episode is hidden within illustrations, and can only by found by coloring in the scenes. In fact, some very astute Sherlock Holmes fans may have even uncovered a yet-to-be confirmed clue that Mary Morstan -- who is also now Mrs. Watson -- is more than just an assassin...she may have been a past employee of none other than Sherlock's nemesis, Moriarty.
The clue causing all the commotion in "Sherlock: The Mind Palace: The Official Coloring Book" among fans is Mary's wedding ring. The coloring book places her ring in the swimming-pool scene where an unidentified marksman (or is that markswoman?) had a gun pointed at Sherlock and Watson during their showdown with Moriarty at the end of Season 1.
But does this mean we might discover more dangerous secrets from Mary's past career in season 4 of "Sherlock" or is the coloring book's author just toying with us?
We'll have to wait until 2016, or perhaps longer, to find out the truth.