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.
Downtown, Richmond heads into his office intent on apologizing to Gwen for considering her as a potential leak. She shuts him down, focusing on work. He has a debate against Mayor Adams that night, and she suggests they start prepping. Richmond bulldozes on, telling her that Jamie -- who is now officially back with the campaign -- was obviously not the leak, so he used him as a chance to do some recon on Adams. Gwen begrudgingly compliments the smart play, saying bitterly, "Jamie must be proud." Richmond says he trusts Jamie after 10 years of working together. "But not me?" asks Gwen. She wonders when she'll finally be let in and wonders what they're doing. Jamie barges into the contentious conversation before he can answer and quickly senses the stress. In his typical, no-nonsense way, he snarks, "Are we going to strategize for tonight's debate, or do we need to indulge in a little family therapy first?" It sort of snaps the quarreling lovers back to reality, and Gwen asks if Richmond has memorized his talking points. He grumbles that they've been discussing his stance on crime and infrastructure for weeks. Gwen coldly walks out of the room to take the call, so Jamie takes the moment to tell Richmond the debate is his big chance to switch momentum, a la John F. Kennedy in his 1960 debate against Richard Nixon.