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 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.