The Ice Truck Killer strikes again, leaving a real nightmare before Christmas at Santa's Cottage. Sergeant Doakes becomes more suspicious about Dexter after uncovering a series of Dexter's lies about his connection to the Ice Truck Killer. Dexter finally finds he is connected to the Ice Truck Killer over a past case involving Harry Morgan and a blood-bath crime scene in 1973 involving Dexter's biological mother. Lieutenant Maria LaGuerta braces herself as Captain Matthews blames her for the department's failure to find the Ice Truck Killer, and he has her replaced. Rudy and Debra spend some quality time together, and Rudy proposes marriage to the smitten detective. Rita decides to take her children, Astor and Cody, to visit Paul, who has been sent back to prison.