This plot is highly derivative of the Hitchcock classic: Strangers on a Train. The whole idea of two people doing each others murders without connected motive is directly from that film. That doesn't make this episode any less compelling, in fact, it was a pretty twisty episode BECAUSE of that. However, it seems to me that the writing post-Ziva has lost direction. We no longer have an underlying subversive plot thread. As a set the episodes don't seem to have a coherent direction. Still a favorite. Still tuning in, but Ziva's departure is not the only change at NCIS (at least from my side of the screen).
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