- Over the summer, Haven spends a week in France with Hermione in late June, goes to Egypt with the Weasleys during August (Sirius notices Peter on Ron's shoulder and informs the Weasleys and the Ministry, so that Wormtail is dumped into Azkaban with a trial), and visits as many of her friends as possible. She is there for Marge's visit before she goes on vacation with the Weasleys, and Marge still doesn't like her or her parents (James and Lily were at Vernon and Petunia's wedding, and Marge found one reason or another to not like them) and so parts of the conversation go differently - though Haven is not forced to say that she goes to a school for criminals, and Vernon doesn't hold the Hogsmeade form over her head as a threat.
- Haven learns about the Lestranges' escape just before her birthday, on the news, and Sirius, who she has been writing to since the end of first year, warns her that whole the brothers are Voldemort's most loyal, Bellatrix has technically been brain-washed into it (James mentions this in Journals Through the Ages), but she doesn't think much of it, given her excitement for her trip to Egypt (where she develops a crush on Bill). It remains unimportant until the train ride.
- On the train, Haven sits with Ron, Hermione, Ginny, Luna and some of her other friends. They manage to get there early enough that there are several open compartments, and so they do not end up in the same compartment as Lupin. When the Dementor shows up, it goes directly for her because it senses a second soul. During the struggle, where the Dementor and Tom's soul play a game of tug-of-war, Haven ends up in the In-Between with the male version of herself from I've Had Ninety-Nine Lives, and they have a discussion (about the Horcrux, which she learns about because when the Horcrux was removed, she saw some of its memories, specifically the conversation with Slughorn, though it was patchy and missing pieces towards the end. Baby Voldemort isn't there because he's been eaten by a Dementor). When Haven wakes up only a few minutes later, it is to a Horcrux-less body, no scar (the scar was the Horcrux), vague memories of a discussion about Horcruxes, an intense need for chocolate, and extremely worried friends.
- While Madam Pomfrey meets with Haven to deal with the after-effects of the Dementor, Hermione, Padma, Theo and Susan meet with their Heads of House to receive Time-Turners. None of them know the others have the Time-Turners, as they are sworn to secrecy, but they do more with the devices than Hermione did in canon. All of them continue to use them throughout their Hogwarts career and are eventually inducted into the Unspeakables, among other school-mates.
- Sirius takes over the post as the History Professor; Remus switches over to DADA. Harris is the new COMC Professor
- At dinner, Haven asks Hermione if she knows anything about Horcruxes, which Hermione denies. They go to the library at the first possible minute, and look for books about them. With no luck, they ask Madam Pince, who dismisses them after being unable to find any information. She goes to Dumbledore, hoping to get some books on the subject that these students are so interested in, leaving Dumbledore to call Haven to his office for a discussion.
- Haven and Dumbledore meet every so often to learn about Tom's past, and to try to figure out what his Horcruxes might be. During this discussion, Fawkes transforms into Regulus Black, who - after recovering from an extended period as a fire bird - helps them find the Horcruxes and defeat Voldemort.
- Regulus and Sirius reconcile.
- Haven signs up for Care of Magical Creatures, Ancient Runes, and Divination, having no interest in Arithmancy. During her CoMC class, she faces Buckbeak, as in canon. In Divination, she listens to Trelawney ramble about the Grim in her teacup, and blathers on about the unfortunate upcoming alignment of Pluto and Mars. Ron rather accurately predicts details about the upcoming years in tea leaves.
- Every now and then, Haven feels like she's being watched. (She is, but the Lestranges are good at hiding in the shadows.) As the Lestranges have no reason to watch the Quidditch match, the Dementors do not approach.
- Haven and her friends go to Hogsmeade, and the Dementors are close enough for her to pass out near the end of the trip, and the incident is witnessed by Malfoy. She discusses the issue with her friends, who encourage her to do some research. She and Hermione come across the Patronus Charm while reading the Defence textbook, and when they are unable to perform the spell on their own, Hermione encourages Haven to talk to Remus, who agrees to help.
- Haven stays at Hogwarts for Christmas, Trelawney makes her prediction about the first to stand, and Sirius sends Haven a Firebolt. She donates her Nimbus to the Gryffindor team.
- At some point, Fred and George aren't careful enough with the map (and given that the Marauders don't show up on it), Remus manages to confiscate it. Fred and George go to Haven, asking her to get the map back for them during one of her lessons with Remus, and Haven agrees, with the condition that they show her how to use it, and give it to her when they graduate. They agree, and Haven does her best to get it back. Of course, she doesn't manage to trick a former Marauder, so she waits to get the map back at the end of the year. When she finally gets it back, Fred and George tell her to keep it.
- (For a crossover: Cedric, Fred and George make the Ancestry Potion and find out that they are the sons of Tyr and Hermes, respectively. The Gods were able to possess Amos and Arthur due to their magic, and that is how they end up with demigod children.)
- During the Gryffindor/Ravenclaw Quidditch match, Malfoy, Pansy, Crabbe, and Goyle dress up as Dementors; Haven is so focused on catching the Snitch that she doesn't notice them at first, and it is only after she catches the Snitch that she notices what is going on down below. McGonagall and Snape are both furious with Malfoy and his minions, and they give a week's worth of detention to everyone involved in the prank.
- Haven goes back to Hogsmeade that weekend. She brings her invisibility cloak because she wants privacy that she was unable to have the first time (many of the shopkeepers were extremely enthusiastic, and several residents were crowding her). When she, Ron and Hermione go up to the Shrieking Shack, she is under the cloak because they needed to make an escape after overhearing information about the Lestranges (she learns what they did to Neville's parents). Malfoy approaches Ron and Hermione, not realizing that Haven is there, and he begins to taunt them. Haven begins throwing snowballs until Crabbe steps on her cloak and yanks the hood off. Her floating head is so discomfiting that Malfoy and co run away. Malfoy tells Snape, who pulls Haven aside to ask why she assaulted his student. He takes points from Gryffindor when she refuses to cooperate with his interrogation.
- The Quidditch final is over quickly, with Gryffindor making only a single goal before Haven catches the Snitch. McGonagall smirks at Snape, who scowls at the reminder that Slytherin has once again lost the Quidditch House Cup.
- Finals take place, and Haven hears Trelawney's prophecy. They go to visit Hagrid, who is devastated about Buckbeak's imminent death. Unlike Harry, Haven does not chase after the Lestranges; instead, she defends herself from Bellatrix whole the Dementors approach. The creatures are too much for Bellatrix, who passes out; Haven casts a Patronus to fend off the Dementors, and then she, Ron, Hermione, and Neville work together to bring Bella back to the castle, where Sirius and various family members and Professors are waiting for them. Rodolphus and Rabastan manage to escape, but Sirius takes Bella in and works on breaking the marriage contract that binds her to Rodolphus.