Outside the station, Holder takes a suit out of a garbage bag in his car. Back inside, Linden is narrowing down whether Rosie was the victim of a serial killer. She does fit the profile (read: airport prostitute) but thinks it's worth taking a look. She mentions finding the ammonium hydroxide in Bennet Ahmed's apartment -- the very same chemical that was found all over Rosie's body. Since Ahmed lied about the cleaning service and was home alone all weekend, he has just jumped to the top of their list.
As they go over more specifics, Holder struts in in his attempt at professional attire. The boss harshly tells him this rumpled outfit doesn't inspire confidence, adding, "You look like you donate plasma for a living." Holder says sheepishly that he's had the suit since he was 19, then changes the subject to whether the judge is giving them a search warrant for Ahmed's place. The boss says it's too circumstantial, which flusters Holder. Linden matter-of-factly adds that it could be a crime scene and Ahmed could be destroying evidence as they speak. Gruffs the boss, "Well, then you better get to work."
Larsen home. Mitch shows the cufflinks to Stan. Rosie picked them out for Father's Day, despite Mitch's insistence that Stan didn't need anything like that. Stan remembers cutting the buttons off his shirt so he could use the present, though he remembers receiving them for Christmas. Stan corrects him glumly, dejectedly, "No. You wore them to Christmas mass, but she gave them to you for Father's Day." Stan insists Rosie put them under the tree, and Mitch finally gets angry. She stands up and raises her voice. They squabble because it keeps their daughter's memory alive. The cufflinks are just one more reminder that the child they loved will never live to see another Father's Day, another Christmas. These well-intended presents will never come from her again, and they'll never make any more memories (even if their memories fail them) that they can look back on. They fight to keep Rosie a part of their daily dialog. Mitch's sister Terry interrupts to ask if they need anything from her. Mitch tells her to check on the boys, then trudges back to the bed and sits down next to Stan. He apologizes. They realize that even if fighting keeps Rosie in their lives, it also tears them apart, and right now they need to stick together.