It’s been six months since Deb (Jennifer Carpenter) killed LaGuerta to save Dexter (Michael C. Hall), and she hasn’t handled it well. She cut herself off from friends and family. Deb left the force to join a firm in the private sector, as a bounty hunter/PI. She also seemed to be self-medicating with drugs and alcohol.
Currently, Deb’s undercover with a violent burglar, Briggs. She’s waiting for him to drop where he hid some stolen jewels. She was also dating him, and had turned the assignment into a two-week undercover mission, instead of just calling the cops.
Deb insisted Dexter stay out of her life, which devastated the serial killer. He’s worried about the downward spiral he caused in her life, and just wants to help his beloved sister.
Dexter found out Briggs had stolen the jewels from the mob, and a hitman was coming after Briggs. He went to warn Deb, who refused to go away with him. She told Dexter she should have killed him instead of LaGuerta.
Briggs overheard the argument, and came to Deb’s defense. He got into a fight with Dexter. Dexter grabbed Briggs’ knife, and killed him with one well-placed stab. Deb was horrified. She told Dexter to get lost because she was calling it in.
Before the cops arrived, she stole a storage unit key off Briggs. The mob hitman watched her from a distance, and now it appeared he would use her to find the jewels.