At the conclusion of last season, the CSIs faced their toughest challenge yet, when bombs where detonated across the city and Det. Flack suffered severe injuries during the explosions. Mac struggled with the guilt of not being able to get Flack and his team out of harms' way, and Stella fought to regain some sense of normalcy after being brutally attacked by her boyfriend. The third season finds the team in search of new beginnings as Det. Flack comes back to the job after slowly recovering from his injuries and Mac secretly begins dating again after the death of his wife. He finds companionship in a co-worker, which presents a unique challenge as he tries to figure out the professional and personal connotations of his private and public lives intersecting.