Complete story — includes the ending
Recent events spur Dexter into his own investigation of the Trinity killer. His motivations are now personal, and the clock is ticking. But the closer Dexter gets, the more he realizes that Trinity is unlike any monster he's previously encountered. Meanwhile, Debra blames herself for events that were out of her control, and in doing so pushes away those closest to her. As LaGuerta and Batista close in on the Vacation Murderers, Batista uses Christine to catch them. However, to avoid their relationship jeopardizing trials, Chief Matthews orders LaGuerta to transfer Batista. Rita discovers Dexter still owns his apartment and begins to realize just how little she knows about the man she married, threatening their marriage. Dexter discovers Trinity's identity, but is unable to prevent him from claiming his next victim, and when he trails him home, he discovers that Trinity has a family.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Dexter season 4. HTML formatting and reference markers removed. · Content license