The second season of Dexter premiered on September 30, 2007, and ended on December 16, 2007. "It's Alive", the season premiere, attracted 1.09 million viewers in the United States, making Dexter the first Showtime series to attract more than a million viewers with a season premiere. The season finale, "The British Invasion", attracted 1.4 million viewers, making it the program's most-watched episode until the airing of the season three finale, "Do You Take Dexter Morgan?". Including digital video recorder usage, season two was watched by an average of 2.4 million viewers on a weekly basis through 11 full weeks, outperforming season one by 21%. The season received universal acclaim from critics, and was praised as "one of the best shows on TV this decade" by the Chicago Sun-Times, while Variety considers Hall's portrayal of the title character as a "towering achievement, one that eclipses the show's other shortcomings and rough patches"; the aggregate site Metacritic scored the season at 85 out of 100 based on 11 reviews.
In the season, the bodies of Dexter's victims are uncovered and an investigation is launched in Dexter's own department to find the killer, dubbed the "Bay Harbor Butcher". During this time, Debra struggles to recover after surviving Ice Truck Killer's attempts to murder her, and Rita sends Dexter to Narcotics Anonymous meetings when she suspects that he has an addiction. Sergeant James Doakes, stalks Dexter, suspecting that he is connected with the "Ice Truck Killer" killings. Three new characters are introduced: Keith Carradine appears as Special Agent Frank Lundy, an FBI agent who heads the "Bay Harbor Butcher" investigation, JoBeth Williams as Rita's mother Gail, and Jaime Murray as Lila Tournay, Dexter's Narcotics Anonymous sponsor.
Things are really beginning to heat up for Dexter: Doakes' suspicions about him are growing, his victims are escaping, and his body dump site has been found. Meanwhile Paul is troubling Rita over the missing shoe and Debra is going through trauma over the Ice Truck killer incident.
Dexter is finding it hard to have closure on killing his brother. There is a new FBI agent to head the "Bay Harbor Butcher" case. Debra is finding it tough to put the past behind her.
Dexter sets his sights on a new victim: a murderer so repulsive it seems only fitting that he's a used-car salesman. Dexter's been unable to lie to Rita about his midnight activities, which has her thinking that he's a drug addict. She's threatened to leave him if he doesn't commit to a 12-step program to deal with his supposed addiction. While in this recovery, though, Dexter meets a sexy, mysterious woman named Lila.
Rita's estranged mother visits and senses something is wrong with Dexter. Masuka thinks he's developed a lead in the Bay Harbor Butcher case, which has Dexter concerned. Angel's interrogation of a witness crosses a line.
Dexter finds out that the man who killed his mother, right in front of him, is still alive. When he tells this to Lila, she suggests he face the man, as part of his road to addiction recovery. But then as his sponsor she insists on tagging along.
A copy-cat killer follows the lead of the "Bay Harbor Butcher." Dexter must destroy an incriminating surveillance video.
Dexter manages to get Doakes off his back. He devises a plan to get the police in another direction. Lila and Dex's relationship intensifies, and he has some interaction with Rita and the kids.
Dexter is attacked by the man who murdered his mother. Meanwhile, Lila wants to get closer to Dex, and Debra and Lundy close in on the Bay Harbor Butcher.
Dexter realizes it won't be easy to end things completely with Lila. Dexter tries to stay ahead of the investigations as the manhunt for the Bay Harbor Butcher intensifies. An enemy of Dexter figures out his secret.
Doakes follows Dexter to his next crime scene and shocks him with a revelation about Harry. The Bay Harbor Butcher task force feels they are zeroing in on their man.
Dexter must make a massive decision that will have an effect on all those he holds close. Lila meanwhile is back with a secret to blackmail Dexter.
The Task force believes the Bay Harbor Butcher case is closed, but Dexter still has some trouble to deal with.