LDSK = Long Distance Serial Killers, another name for "Snipers." Whatever you call it, or the BAU of the FBI wants to call it, that is what they have to deal with next as a shooter has picked off three people in two weeks in a park in Des Plaines, Illinois. He then continues to shoot more victims, but he's not killing anyone, just wounding them in the abdomen. What gives?
The BAU team learns on the-job on this case since they really have no profile of this type of person. They find out it has to be someone familiar with police schedules and procedures, so the logical choice is a local cop.
The cops are told this in private, and not to let the information pass fr om the room, but one of them leaks it to the press. This guy really w ants publicity! However, finding exactly who it is, is not easy and leads to a somewhat surprising and very dramatic ending. One of things that happens is "Hotch" kicks and beats up his partner "Dr. Reid!"