Sisters Tory Vega and Darcy Vega are woken by a strange gong and a message on their magical communicators, called Atlases, announcing the official start of Hell Week. Principal Nova’s message explains that all freshmen will undergo trials and be tormented by upperclassmen to prove their Fae worth. In their House common room, they’re immediately ambushed by students in black cloaks and white masks, led by their rival, Marguerite Helebor. Marguerite uses her power of Coercion to paralyze the twins and writes “Whore” on Tory’s forehead and “just talk to my raven” on Darcy’s with a magical marker that won’t wash off (40).

They soon find their friend Sofia Cygnus hiding from Terra House juniors who are tying the other freshmen to a campus tower. Sofia, who has “Vega ass-licker” written on her own forehead (41), uses a spell from a library book to remove the magical ink from all three of them. Just as they’re discovered by the juniors, Sofia transforms into her Pegasus Order form, and the twins leap onto her back. They fly away to safety, resolved to survive the challenges of the week.

In Cardinal Magic class, Darcy and her classmates read a slanderous article by reporter Gus Vulpecula, which falsely blames the twins for student deaths during the Nymph attack. However, a fellow student, freshman Tyler Corbin, approaches them to express his gratitude for their bravery, giving them enchanted leaves that display the words “Thank you.”

Their professor, Lance Orion, begins a particularly antagonistic lesson to prepare the students for the aggressive nature of Hell Week. He takes a prized beanie from Tory and Darcy’s friend Diego Polaris, daring him to come take it back. To demonstrate the importance of motivation, he magically suffocates another student, Kylie, until her friend Jillian correctly names three constellations in Latin. He then reveals the week’s schedule of Elemental Trials. 

While Orion is momentarily out of the room disciplining another student, Diego snatches his beanie back and gives it to Darcy to hide. Orion quickly deduces that Darcy has it and threatens to dock House Points from the entire class for every minute she keeps it hidden, forcing her to return it. The class ends with Orion challenging Diego to devise another way to retrieve his hat.

During lunch, Caleb Altair, a vampire and one of the four Heirs—offspring of the Celestial Councillors that govern the realm—sends Tory a message initiating a game in which he chases her in order to feed on her. Recalling Professor Orion’s advice to fight back against being bitten by vampires, Tory accepts the challenge and hides in the campus library. Caleb drops four stories using enchanted vines and catches her on the ground level. After feeding, he invites her to his room that night. She declines due to the curfew, saying that she’ll only consider it if he runs her to class on time.

Later, in their Fire class, Professor Pyro assigns the Heirs to assist the twins. Darius Acrux, a member of the Dragon Order, is paired with Tory, while Caleb teams up with Darcy. Tory and Darius practice by holding hands to share power, a process that creates intense magical and physical tension between them. Tory makes a wager with Darius: If she can create a functional motorcycle out of fire, they will race, and if she wins, she gets to keep his bike. Aided by Darius’s power, she succeeds in forming the fire motorbike, and Darius declares that they have a race date set for Wednesday.

Darcy attends her Liaison session with Professor Orion, planning to request a new mentor due to their mutual attraction and the tension that exists between them since their kiss in the previous book. Orion, however, is focused on a new theory: He believes that the twins, who have yet to manifest in a specific magical Order, may be a rare, extinct species known as the Ismenian Dragon and gives her a book on the topic. To break the awkward silence, he takes Darcy to a meadow to practice magic. He provokes her by magically throwing her hundreds of feet into the air, hoping that the fear will awaken her Order powers. Their encounter escalates into a mock duel, during which Darcy shoots water at him mid-vortex, he loses concentration, the vortex drops her, and she collides with him on landing—her wrist snapping beneath his weight.

He immediately uses his powerful healing magic to mend the bone. The fight ends with Orion pinning Darcy to the ground, their proximity reigniting the forbidden attraction between them. He confesses that he can’t think straight when he’s near her and thanks her for saving his life during the Nymph attack. Darcy insists that their sessions must stop, and he agrees. However, once back in her room, she receives a message from him that reads, “What if I don’t want it to stop?” (93), leaving her conflicted.

Seth Capella, a Werewolf, undergoes treatment for fleas—the result of a secret curse performed by Darcy and Tory. During the treatment, his pack members shun him. A pack member named Alice confronts him, revealing that she learned from Frank, another pack member, that Seth has made Darcy—a non-Wolf—his Omega, the lowest rank in the pack, and that the pack will not follow him until he removes her. Distressed, Seth goes to the Heirs’ secret hideout, King’s Hollow, where he discovers that another Werewolf is attempting to usurp his Alpha position online. He seeks physical comfort from Caleb, who rejects his advances.

Seth confides in Caleb about accidentally making Darcy his Omega. The Heirs discuss the Vega twins, acknowledging that the strength of their power, revealed during the Nymph attack, makes them a credible threat to the throne. The conversation takes a dark turn when Darius reveals that his father, High Lord Lionel Acrux, won’t tolerate this threat and will likely try to kill the twins before they can fully realize their powers and emerge in their specific Order.

Tory and Darcy attend their Dragon Order Enhancement class, which is taught by Darius since he’s the most powerful Dragon at the school. Neither twin can summon the unique red and blue fire they manifested during the Nymph attack. As they’re leaving, Max Rigel, the Siren Heir, uses his powers to make Darcy feel an urgent need to urinate so that he can speak to Tory in private away from everyone else.

Max explains that he wants to repay the debt he owes her for keeping his part-Nymph heritage a secret. He offers to teach her any magic she wants to learn. Before Tory can stop him, Max uses his Siren gifts to compel her to confess her worst fear: deep water. He offers to teach her how to breathe underwater so that her fear will be neutralized. To prove that his intentions are genuine, he extends his hand and allows her to briefly read his mind when she takes it. At a nearby hot spring, he shows her how to create a pocket of air around her face using both air and water magic. Once Tory masters the technique, Max vanishes, leaving a message on her Atlas declaring that his debt is paid and that they can return to being enemies.

As Darcy and Tory head to their Earth Elemental class, they run into Tyler, who warns them away from the main path where seniors are tormenting freshman for Hell Week. Tyler shifts into his Pegasus form and carries Darcy and Tory to class by a different route. In return, he asks them to put in a good word for him with their friend Sofia. At dinner, the twins play matchmaker, and Tyler successfully asks Sofia on a date. Darcy leaves to meet Seth for her pack initiation. On her way, she exchanges messages with Professor Orion, who tells her that in their kingdom, blue—the color of her hair—signifies royalty.

Darcy arrives at her meeting with Seth, wary that it’s a trick. To put her mind at ease, he sends her an incriminating video of himself to use against him if he violates her trust. Saving the video as insurance, Darcy agrees to the ritual. Seth transforms into his Wolf form and takes her for a thrilling run along the cliffs. He explains that to complete the initiation, they must bond. He shares the traumatic story of his childhood “Forging,” a brutal survival ritual where he was abandoned on a mountain at age five in his Wolf cub form, per his father’s instructions. Moved by his vulnerability, Darcy hugs him. Seth declares that the hug has fulfilled the requirement, and she’s now officially initiated into his pack.