When Dex’s ex Fiona, a famous musician, comes into town for a performance, Dex must protect her from a stalker. Meanwhile, Grey continues to receive the cold shoulder from Dex, and Tookie and Lieutenant Cosgrove develop a new friendship.

Dex goes undercover after she is hired by a local politician to dig up dirt on his political opponent. Meanwhile, Grey and Liz’s romance continues, and Dex celebrates a tense Friendsgiving at Bad Alibi.

Dex is confronted with unresolved feelings from her past when she is hired by Sue Lynn to investigate a case with the widow of Dex’s former flame. Meanwhile, Dex and Grey’s friendship is put to the test by his new romance with Liz.

Dex goes undercover as a high school substitute teacher after an old classmate of hers enlists her help to find out who planted drugs on her daughter. Meanwhile, Dex and Liz’s relationship gets too close for comfort.