The first season of the CBS American television drama series Unforgettable was premiered on September 20, 2011, and concluded on May 8, 2012, after 22 episodes. It was broadcast on Tuesdays at 10:00 pm.
Plot
A former Syracuse, New York, police detective, Carrie Wells, has hyperthymesia, a rare medical condition that gives her the ability to visually remember everything. She reluctantly joins the New York City Police Department's Queens homicide unit after her former boyfriend and partner asks for help with solving a case. The move allows her to try to find out the one thing she has been unable to remember, which is what happened on the day her sister was murdered.
Carrie Wells seems like a typical girl living in Manhattan, volunteering at a nursing home and living her life as usual. But there's more to Carrie than meets the eye. As a young girl Carrie was diagnosed with hyperthymesia, a rare condition that makes her memory so flawless that she can't forget anything. She remembers every person she has met and every place she has been, every conversation, every moment of joy, every heartbreak – except for one day: the day her sister Rachel was murdered. When a homicide case reunites Carrie with her ex-boyfriend and partner Al Burns, she decides to permanently join his unit despite her conflicted feelings and try to solve Rachel's murder. Because all she needs to do is remember.
Once Carrie is working as a cop again, she must help a little boy who witnessed his parents' murder. Thus, she has to put aside her memories about her past and her sister to help him remember who was the killer.
Carrie's memory becomes crucial when a crime scene is destroyed in an explosion, moments after she catches a glimpse from the place. They discover a plot involving prison inmates and the kidnapping of a little girl.
When Al's ex-partner is gunned down and the investigation reveals he may have been a dirty cop, Carrie must decide how to support him without getting too close. Al is in danger when he is lured to a trap, and his life is in Carrie's hands.
When a single dad is killed, Carrie races to find both the killer and the man's daughter. Meanwhile, her search into Rachel's killer goes ahead, when her mother gives her a clue.
Al and Carrie investigate the murder of a teen who seemed to have no enemies. Meanwhile, Carrie looks to her estranged aunt for help with the investigation into her sister's murder.
When investigating on a gang related crime scene suddenly gunfire goes off and a second murder occurs. Al and Carrie have to go through hundreds of bystanders to find out who is responsible for the killings.
When a renowned ghost hunter is killed, Carrie and Al discover that his death may be linked to a chilling discovery he made recently. With Britt Lower as Tanya Sitkowsky.
When a construction worker with a promising future is murdered, Carrie and Al wonder if his ties to the mob were the cause of his death or an unrelated coincidence. Meanwhile, Steve Cioffi (Jackson Hurst), the son of a mob boss, falls in love with Carrie.
A serial killer with knowledge of Carrie's memory abilities taunts the Queens PD as his list of victims grows. Jane Curtin joins the cast as Medical Examiner Joanne Webster.
Al and Carrie are forced to the sidelines by a negotiator when the father of a suspect that Roe shot takes members of the Queens PD, including Nina, hostage in a desperate quest for justice.
When Carrie's latest case is stalled by a powerful family's influence, she receives assistance from a lawyer who may be the mysterious caller who orchestrated a series of sniper attacks.
Carrie's personal and professional lives collide when her boyfriend, the son of a mob boss, is revealed to have ties to suspects in a murder investigation.
When Walter Morgan turns up dead, Carrie must locate his killer while deflecting attention from the prime suspect - her. At the end of the episode the team finds a cellphone that belongs to the Syracuse Police Department.
On the trail of her sister's murderer, Carrie returns to Syracuse, where the killer may have struck again. Things get complicated when Carrie is kidnapped. At the end of the episode Carrie finds a box with all the information about Rachel's murder.
Ratings
Viewership and ratings per episode of Unforgettable season 1