Homicide is called in to assist Rachel and Frank in their investigation of the death of an Iron Man competitor whose shark-ravaged body was found washed up on a beach. Despite the man's body being full of steroids, the autopsy says the man died of a heart attack, which baffles the detectives.

Gavin's actions are questioned when a rich businessman is arrested for drink driving, and decides to take legal action when the boat is later found drifting with a large hole in it.