Sherlock was a series that aired on BBC from 2010 to 2017. It starred Benedict Cumberbatch and Martin Freeman as Sherlock Holmes and Dr. Watson, respectively. It ran for a total of four seasons that consisted of essentially three hour-and-a-half-long movies per season and had one stand-alone episode that bridged seasons three and four. Each episode told modified stories from the books. Except for the stand-alone episode "The Abominable Bride," set the stores in modern-day England. The Abominable Bride was the only episode with the story (mostly) set in the late 1800s. The show sported a great cast, with Benedict Cumberbatch and Martin Freeman at the head as Sherlock Holmes and Dr. John Watson, respectively. The two had great chemistry, bringing to life the relationship between Holmes and Watson set out in the stories written by Sir Arthur Conan Doyle and adapted by the series' writers. The series gets progressively darker over time, which not everyone that is a fan of the show likes. The writers do an interesting job with the character of Moriarty, who is, of course, Sherlock's main adversary. He is used relatively sparingly throughout the series, really only being the focus of one episode, but in the background of almost all of them. Andrew Scott does a great job with the character and definitely makes him a worthy adversary for Sherlock.
The Blu-ray extras are more extensive in seasons one and two than in seasons three and four. They generally include commentary tracks, as well as behind-the-scenes and making-of featurettes. There are no deleted or extended scenes. For season one, the show's original pilot is included, which was remade when the network decided it wanted longer episodes. Overall, the series is very good to great. It, of course, made Cumberbatch and Freeman breakout stars. Still, the entire cast, whether they were series regulars like Rupert Graves, Una Stubbs, or Louise Brealey, or recurring or one-off characters like Mark Gattis (who was also the co-creator of the show), Andrew Scott, or Lara Pulver, was always wonderful.
As others have noted, the first set I received was really beaten up, with all the cases broken or cracked. I did a return and replacement and the second set was fine. So, definitely check out your set immediately because it seems like a bad batch of them out there.