Title: Sin City Blue
A riff off the title of the critically acclaimed, long-running cop-drama N.Y.P.D. Blue, with Sin City (a common nickname for Las Vegas) in place of the "NYPD" (New York [City] Police Department). The term "Blue" in this case is meant to refer to the traditional uniform color for police.
Catherine: My body's done. "Smurf's up!"
A macabre two-way pun -- since she's using blue fingerprint powder on the girl's body, the body winds up a bright blue color reminiscent of the popular Belgian cartoon characters known as Smurfs. In addition, there is a classic beach slang, "Surf's Up!" for the time of best surfing, when the waves are at their highest and conditions are ideal.