Still reeling from the recent death of his partner, the last thing that homicide detective Riley Schiller wants is a new one. But that's exactly what his captain gives him - a hotshot detective, Katelynn Martinez, who transferred from the Vice Squad. They're still getting used to working together when they get their first case - now they have to figure out why a 5-year old child was murdered in an office building in the middle of night, and what that has to do with terrorism.