After JJ and Paige break up, JJ manages his broken heart by throwing himself 100% into his studies, which means a lot of late nights at the library. This worries Jen, who thinks that it's not healthy for JJ to do this, and her worries are only exacerbated when Hope, who is investigating a string of robberies in the dorms, mentions to Jen that Salem U is not a safe place at night anymore. Maggie offers to step in to talk to JJ, but JJ tells her that he's not Brady and is never going back to drugs so she doesn't have to worry, but doesn't want to talk to her--or anyone--about his feelings.
In the meantime, Rory gets involved with an elaborate plan to cheat on exams, and wants JJ's help. When he doesn't want to, Rory becomes resentful because he feels everything is easy for JJ, while Rory doesn't have any family support and school doesn't come easily to him. JJ tries to convince Rory that he can do more than he thinks and doesn't have to resort to cheating, but Rory isn't having it and tells JJ that their friendship is over. This leaves JJ even more depressed, but he's also determined to find a way to help Rory rise above his problems.
Daniel gets a call from Parker's preschool that Parker is complaining of dizziness. At first, Daniel thinks it's nothing serious, but Parker continues to have episodes of dizziness and sometimes seems to be short of breath. Daniel thinks it may be asthma and takes Parker to the hospital after Parker's breathing difficulties intensify. At first, Daniel is in charge, but Kayla finds out and won't let him be the doctor to his own child. She takes over Parker's care, and Parker is diagnosed with a rare heart disease. Daniel is devastated both by his son's disease and by his own inability to catch it or cure it. Nicole reaches out to him and is able to relate to his pain because of the loss of her children, though she quickly reassures Daniel that Parker is not going to die. The two get closer again as Nicole supports Daniel and Parker through this crisis. Jen, of course, is not happy, but she is preoccupied with her concerns about JJ. Chloe (returning briefly when Daniel tells her the news about their son) is also not happy, and questions whether Daniel was "distracted" by Nicole and thus missed diagnosing and treating Parker correctly, causing Daniel to question himself. When a patient has a bad reaction and nearly dies during a routine surgery, Daniel is further shaken and decides to take a leave of absence from the hospital. Marlena comes to see him and talk "doctor to doctor," but really wants to offer support and some words of wisdom. She talks with Daniel about how difficult it is to be the one who needs support instead of the one supporting everyone else.
Roman, Rafe and Hope all work together on investigating the Salem U robber, though Roman insists that Hope be consulted on this case only as needed. Hope is angry at being left out and wants to play a major role in this investigation, but Roman won't let her because he's afraid it'll ruin her budding relationship with Aiden. Hope feels Aiden will just have to get used to it, but Roman points out that Hope divorced Bo because she couldn't just get used to him being halfway around the world, and it isn't fair to put Aiden in the same position. Hope agrees, but she's distracted during her and Aiden's romantic evening. When Aiden wants to know what's wrong, she talks to him about her frustrations, leading to more closeness, though she's not sure how to take it when Aiden jokes that he'll probably be defending whoever the Salem PD eventually arrests.
The robber has graduated from breaking in to dorm rooms to attacking students as they walk on campus, and JJ is still staying on campus late at night, worrying Jen, who finds her friendship with Eric to be helpful in keeping her from trying to control the situation. Across town, Eve is equally worried because Paige has decided to move into the dorms in order to get some space from her mother. Paige wants more independence and won't be dissuaded, despite Eve's concerns about her safety. One night soon after Paige's move, she runs into JJ on campus and accuses him of stalking her, which he denies. He walks off feeling sad and angry, and Paige walks off in the other direction, not noticing somebody lurking in the shadows...
Eve, frantic that she can't get in touch with her daughter, runs to Jen's in a panic and demands to know if JJ has heard from Paige. Jen angrily tells her that JJ's been through enough and that he and Paige are through, but Eve didn't come there to accuse JJ; she asks Jen how she would feel if JJ wasn't answering his phone and she just knew something was wrong. When Eve receives a text suggesting Paige has been kidnapped, she suddenly remembers that Jen was an investigative reporter once and begs Jen to help her find her daughter. The two reluctantly join forces, though Jen also convinces Eve to call the police. Abe apologizes to Jen outside of Eve's presence, but he has to question JJ because witnesses saw them fighting right before Paige disappeared. In the meantime, Rafe questions Rory, and since there's no evidence, both boys are released, but the police can't rule them out either. JJ and Rory also band together because finding whoever really did this is the only way to clear both of their names. JJ also decides to ask Nicole for help, which she's all too willing to give (though Rory doesn't quite trust her because in "the old days" she was always giving JJ the evil eye). Nicole's boss has been giving her fluff pieces and she wants a real story.
(Like Jason, I just threw something together quickly, and I'm sure if I think about it I can add some other storylines, but I thought this was a good enough start.)