A couple are out on Lover's Lane, getting it on in their car. Not consensually, however - they're being forced to have sex by a man sitting in the front seat, aiming a pistol at them!
Naturally, he kills them, and the next day the team is on the case! It seems that two couples have been killed, only a week apart. Emily refers to this as 'not much of a cooling-off period', which is strange, considering that by the standards of this show, one kill a week is positively glacial. And again, I'm not sure how she knows the term 'cooling-off period'.
Before they can head off to Ohio to sort out the crime, Garcia swings by Greg's office, asking if she can come along as the communications liason. There's some blather about her job crossing over the most, and how important it is to have one, but the fact is, last week the team was without a communications liason, and absolutely no one noticed.
Also, isn't it much more important that they have a tech expert ready to go at a mainframe the second they need the information? Since she solves almost every case for them? Let's compare cases solved by Garcia to cases solved by JJ. It's an easy comparison:
Garcia: All of them.
JJ: None of them.
Whose role is more vital for the team again?
Hey, new opening credits team shot!
And how long has this explosion been in the opening credits?
Nothing ever explodes on this show.