In King's Beach California some graduating high school students are partying on the beach to celebrate the end of classes. A couple wanders off to be alone, and has the bad luck of heading towards the lifeguard shack from which a shadowy figure had been observing the proceedings. As they make out underneath the shack the couple notices blood dripping down through the floorboards. The man of the couple heads in to check out the source alone - because it's not like there's twenty teens armed with cell phones fifty feet away - and discovers a corpse with a mutilated groin, and what might be another two wrapped in plastic. It's kind of hard to tell.
Garcia lays out the details of the case - three dead guys, all shot in the head, genitals removed. And, as we learn in a cutaway, the killer's already murdered number 4! They talk a little about the possibility that the guy is recently out of prison, and that the lifeguard tower wasn't due to open for a month, which may well be important. I think the shack deserves a little more attention - you've got a presumably lone guy going to the trouble of lugging ~200 pound corpses into a small building with absolutely no cover around it. And it's an LA-adjacent beach, meaning that there's no time of day when you can be sure that no one's going to be wandering by. All of this conspires to make a lifeguard shack essentially the worst possible place to hide bodies, meaning they must hold some special significance to the killer. Or, you know, bad writing.
Also, and I know I say this all the time, but couldn't they be doing this on the plane? It's not like they're debating whether or not to go on the trip. Are they just shooting in the conference room so that they can justify the cost of the set?