Night has fallen, and Megan's busy looking at images of Cameron skateboarding when Calleigh comes in to confirm that the gunpowder she found at La Casa Medina matches the gun used to kill Father Carlos. She and Speedle make an enthusiastic case for a murderous minor. These kids today, with their skateboarding and their priest-killing! Megan debunks that theory by pointing out that the time-stamp on the Ollie Oop photos she has places Cameron at the skate park during the time in which Father Carlos was murdered.
Fortunately, the three of them have time to come up with a new theory, because we're about to spend time with the Fetal Avenger. Horatio comes in to talk to Delko, who asks sympathetically, "Was it as bad as they say?" Horatio broods, "It was worse, and the CODIS search for the father's DNA is negative." Delko correctly notes that it's hard to search with half the DNA. Then he delivers some interesting news: the woman's dress was covered in cognac, but the melted glass wasn't. In fact, the glass was covered with a variety of other substances: sulfuric acid, sugar, gasoline, potassium chloride. Horatio takes note of the list and asks, "That's an exothermic reaction, isn't it?" Delko tells us all how to make a Molotov cocktail: "That's right. You paste the potassium chloride and the sugar to the label, then you pour sulfuric acid and gasoline into the bottle. And when the bottle breaks, you serve up a Molotov cocktail." Well, it's heartwarming to know that not every bomb recipe can be blamed on the internet. Except for people who are off to blow things up after this recap -- I accept no responsibility for your actions, chumley. We see the SUV blow up one more time (someone on this show is amortizing costs per explosion) and then Horatio muses that perhaps the Molotov cocktail points to a homicidal bent on the part of the person who began rolling the SUV downhill. Before Horatio can go from musing to brooding, Delko heads him off with more evidence and asks him to check out the diamond under the scope. Horatio does; there's a label on the base, Stewart Diamonds. Horatio says, "I can tell you this was done with an excimer laser, and its inscription point was no more than three microns in diameter." What Horatio cannot tell us, however, is what the hell an excimer laser is or why it matters. Delko references David Caruso's c.v. by chortling, "How do you know that? Were you a jewel thief in another life?" Horatio adds more dimension to this c.v. by replying, "In another life, I incarcerated many a jewel thief." Delko wonders why you'd ruin a perfectly good diamond with a $30,000 billboard. Because it wasn't enough to know that the rock was probably mined by slave labor in Africa? Horatio sets him straight: "They reserve this for the best diamonds and the best customers."