S1E1

 
     Invalided home from the war in Afghanistan, Dr.
     John Watson becomes roommates with the world's only "consulting detective,"
     Sherlock Holmes. Within a day their friendship is forged and several murders are solved.

S1E2

 
     Mysterious symbols and murders are showing up all over London,
     leading Sherlock and John to a secret Chinese crime syndicate called Black Lotus.
         

S1E3

 
     Mycroft needs Sherlock's help,
     but a remorseless criminal mastermind puts Sherlock on a distracting crime-solving spree 
     via a series of hostage human bombs through which he speaks.
     

S2E1

 
    Sherlock must confiscate something of importance from a mysterious woman named Irene Adler.
     

S2E2

 
    Sherlock and John investigate the ghosts of a young man 
    who has been seeing monstrous hounds out in the woods where his father died.
    
    

S2E3

 
    Jim Moriarty hatches a mad scheme to turn the whole city against Sherlock.
    

S3E0

 
    John and Lestrade try to move on with their lives after Sherlock's apparent death.
    However, Anderson believes he is still alive.
    
    

S3E1

 
    Mycroft calls Sherlock back to London to investigate an underground terrorist organization.
    

S3E2

 
    Sherlock tries to give the perfect best man speech at John's wedding  
    when he suddenly realizes a murder is about to take place.

S3E3

 
    Sherlock goes up against Charles Augustus Magnussen, media tycoon and a notorious blackmailer.
    

S4E0

 
    Sherlock Holmes and Dr. Watson find themselves in 1890s London in this Christmas special.
    
    

S4E1

 
    Sherlock takes on the case of finding out who is going around
    and smashing six unique head statues of late Prime Minister Margaret Thatcher.
    

S4E2

 
    Sherlock goes up against the powerful and seemingly unassailable Culverton Smith 
    - a man with a very dark secret indeed.
    

S4E3

 
    A dark secret in the Holmes family rears its head with a vengeance,
    putting Sherlock and friends through a series of sick, 
    manipulative psychological and potentially fatal games.