"Elementary" stars Jonny Lee Miller as detective Sherlock Holmes and Lucy Liu as Dr. Joan Watson in a modern-day drama about a crime-solving duo that cracks the NYPD's most impossible cases. Following his fall from grace in Londonand a stint in rehab, eccentric Sherlock escapes to Manhattan where his wealthy father forces him to live with his worst nightmare - a sober companion, Dr. Watson. A successful surgeon until she lost a patient and her license three years ago, Watson views her current job as another opportunity to help people, as well as paying a penance.
However, The Restless Sherlock is nothing like her previous clients. He informs her that none of her expertise as an addiction specialist applies to him and he's devised his own post-rehab regimen - resuming his work as a police consultant in New York City. Watson has no choice but to accompany her irascible new charge on his jobs. But Sherlock finds her medical background helpful, and Watson realizes she has a knack for playing investigator.
Sherlock's police contact, Capt. Tobias "Toby" Gregson (Aidan Quinn), knows from previous experience working with Scotland Yard that Sherlock is brilliant at closing cases, and welcomes him as part of the team. With the mischievous Sherlock Holmes now running free in New Yorksolving crimes, it's simple deduction that he's going to need someone to keep him grounded, and it's elementary that it's a job for Watson.
In the Season Finale, Holmes was subjected to a series of devious machinations by Oscar, an unstable roommate from Sherlock's time as an addict. Oscar's manipulations caused Sherlock to lose his temper, assault Oscar, and ultimately relapse. While Sherlock prepared himself for the fallout of his brutal actions and the end of three years of sobriety, he and Watson received word that Sherlock's estranged father was coming to New York.
Holmes attempts to rebuild his life in the wake of his attack on Oscar and subsequent relapse. Due to his violent actions, Sherlock's partnership with Watson and their consultancy with the NYPD are in jeopardy. As he awaits news on whether or not he will face criminal charges, the case of a missing woman allegedly killed by her husband lands in his lap, just in time to distract him from the impending arrival of his estranged father, Mr. Morland Holmes (John Noble).