Television thrillers with a sophisticated, well-constructed plot sometimes have something else falling apart in addition to various murder victims: logic. The attentive viewer also comes to this conclusion at the last Cologne WDR “Tatort”, “Four Years”, with the investigator duo Schenk (Dietmar Bär) and Ballauf (Klaus J. Behrendt). The actor Moritz Seitz (Thomas Heinze.. .