Holmes and Watson look into the death of a member of Holmes’ online beekeeping community who was a researcher looking into a deadly Northeast honey bee outbreak. During the investigation, they meet Tara Parker, a brilliant entomologist, academic and the leader of New York’s beekeeping society. Also, Captain Gregson enlists Watson’s services in an off-book investigation that helps him make a life-changing decision.

The episode was rated 7.55 from 1628 votes.

Holmes and Watson find themselves in the middle of a civil war being fought on the Internet when a member of Everyone, the anonymous hacker group they periodically work with, is murdered.

The episode was rated 7.55 from 1838 votes.

Holmes and Watson enter the world of rare antiquities when they investigate a case in which victim was killed during a Revolutionary War reenactment. Holmes finds solace in his growing friendship with Michael.

The episode was rated 7.55 from 1662 votes.

Holmes and Watson investigate the murder of a former professional eSports video game player during a live video stream. Shinwell approaches Joan for advice when his teenage daughter asks to meet with him for the first time in years.

The episode was rated 7.54 from 2943 votes.

Watson and her half sister, Lin, have conflicting reactions when their estranged biological father dies. Holmes and Watson find themselves on the hunt for a stolen plutonium shipment they fear will be used to make a dirty bomb after a Department of Energy inspector is killed with a lightning gun.

The episode was rated 7.53 from 1687 votes.

Holmes and Watson investigate a murder that initially looks like a road rage incident, but takes a new direction when they learn the victim was flash-frozen at the time of death. Also, when Watson’s mother finds out Joan’s brother is cheating on his wife, she puts Joan in the awkward position of confronting him about the affair.

The episode was rated 7.53 from 1803 votes.

Sherlock and Joan investigate the murder of a criminal who made his living by stealing from other criminals. When Gregson resumes leadership of the precinct, he suspects his interim replacement is responsible for one of his best detective’s suspicious departure.

The episode was rated 7.52 from 1158 votes.

When Watson joins forces with Holmes and Kitty to locate a missing nurse she used to work with, the woman’s trail leads them to another person who has recently disappeared.

The episode was rated 7.52 from 1350 votes.

When Holmes’ investigation into the attempt on Morland’s life pushes their strained relationship to the breaking point, the identity of Sherlock’s mother is revealed. Also, when three gang members are murdered, Holmes and Watson are amazed when an elderly woman emerges as their prime suspect.

The episode was rated 7.50 from 2103 votes.

Holmes and Watson retrace Holmes’ steps after he finds himself in possession of a severed head and no memory of the past six hours or why he has it.

The episode was rated 7.48 from 1592 votes.