Season 4 ends with Holmes and Watson facing reprisal from the perpetrator who wants Morland dead, and realizing they dangerously underestimated the scope of their new enemy's influence.
Holmes and Watson discover the perpetrator behind the attempt made on Morland's life and find a shocking connection to themselves.
Holmes suspects his father of murder after one of Morland's employees is killed under the guise of a robbery.
Holmes and Watson investigate a double homicide and discover the victims were staging a fake murder at the moment they were killed. Meanwhile, Joan's inside man at Morland's office encounters a problem that threatens to expose her spying to Holmes and his father.moreless
Holmes and Watson investigate a woman's murder and learn her death is linked to a piece of artwork that has ties to a crime that was committed when she was in college. Meanwhile, Joan tries to forge a connection with a recent client in the wake of a shocking personal revelation.moreless
A mysterious woman who claims to be a former associate of Sherlock's brother tells Holmes that her life is in danger. It's soon revealed that the woman runs illegal, high-stakes poker games. As Holmes and Watson investigate, Joan becomes suspicious that their new client isn't being truthful.moreless
A survivalist doctor goes missing, and Holmes and Watson must determine whether he purposely went off the gird or is a victim of foul play. Meanwhile, Sherlock exhibits odd behavior when his romantic relationship with Fiona hits a rough patch.moreless
Holmes and Watson investigate the murder of a man who secretly fought crime dressed as a comic book superhero. Meanwhile, Morland makes a surprise donation to Watson's favorite charity, in order to compel her to do him a business-related favor.moreless
At the urging of Morland’s wealthy associate, Henry Baskerville, Holmes and Watson investigate the bizarre death of his brother who was reportedly chased to death by a large, glowing animal too fantastic to be real. Trauma from the bombing at the morgue begins to negatively impact ME Hawes’ work.moreless
Watson discovers Capt. Gregson's secret relationship with a former female NYPD officer and inadvertently sets the couple's breakup in motion. Meanwhile, Holmes investigates the murder of a wealthy woman who left her vast estate solely to a beloved dog.moreless
The identity of Sherlock's mother is revealed and his strained relationship with Morland reaches a breaking point. Meanwhile, an elderly woman emerges as the prime suspect in the murders of three gang members.moreless
Holmes and Watson search for a murderer who used poisonous mushrooms to kill a botany professor and a group of the instructor's students. Meanwhile, Joan learns that her neighbor is renting his home through a vacation site that caters to hard partiers.moreless