Sherlock faces the consequences of his actions, including the arrival of his father. While waiting for word from the DA, Holmes and Watson investigate a cold case at the behest of the lead suspect, who makes a request Holmes can't refuse.

Sherlock and Holmes consult with the FBI on a multiple homicide case involving a DARPA sponsored lab.

Sherlock and Watson are back working with the NYPD on a double homicide involving a doppelganger of the intended victim. Sherlock offers his consulting services to his father, to help him finish his business in New York.

Sherlock and Joan investigate the murder of a struggling archaeologist who was seemingly killed for some vintage video games he unearthed.

Morland offers to act as one of his son's "Irregular" consultants so that he can lend Sherlock and Joan his considerable resources to help them solve a case.

The duo goes against a clever opponent, who forces Holmes to think out of the box. Meanwhile Watson's troubles with her father are brought into focus when he writes a book about her and Holmes.

Sherlock thinks Watson and Det. Bell are having an affair. A series of apparently connected events occur after a murder which forces the detective to question his own theory at every step.

A Russian billionaire is assassinated in New York and Holmes and Watson embark upon several instances of hacking and weaponory business. Meanwhile, a secret about Morland, Sherlock's father is revealed.

A social worker asks Holmes and Watson to investigate a private college, when she becomes convinced that they have murdered one of her colleagues.

When evidence at the morgue is destroyed, suspicion falls on emerging gangs. Holmes believes that identifying a Jane Doe will help him unlock the case, while Watson deals with the reappearance of an old adversary.

Sherlock is recruited to heist a computer from a violent meth dealing motorcycle gang. While a former suspect from a previous case asks Joan to run a background check on her new boss.

When a gathering of mushroom aficionados are found dead, Holmes and Watson must explore an array of botanists, biochemists, academics and stoners for a poisoner.

Holmes investigates the assassination attempt on his father while trying to solve the triple homicide of Chinese gangsters. A secret about Sherlock's mother is revealed.

When a vigilante dressed as a comic book hero is murdered, it's up to Holmes and Watson to find the man's true identity and locate his killer; Moreland tries to charm Watson into doing him a favor.

Holmes and Watson are called in to help locate a missing doctor. It is unclear at first whether he has gone into hiding or is a victim of foul play. Holmes and Fiona's relationship takes a new turn.

Holmes and Watson investigate a burglary at an illegal high stakes poker game held by Mycroft's ex girlfriend. Watson is suspicious of their employer.

Holmes and Watson investigate the murder of a young woman whose college selfie was turned into a piece of contemporary art. Watson tries to get closer to her half-sister.

Holmes and Watson investigate a double murder which is not what it first appears.

Sherlock's father, Morland (John Noble), becomes Sherlock and Joan's prime suspect in a murder investigation after one of his employees is killed under the guise of a robbery.

Sherlock's suspicions concerning Moriarty's handiwork turn out to be true and her evil successor is revealed. Morland's desire for vengeance causes Sherlock to consider just which brand of justice this new villain warrants.

Vikner's diabolical maneuvering to secure his position becomes known. Sherlock concocts a plan to unseat him only to unwittingly enable a power struggle the ends of which he could barely have believed possible.