Chapter 1: Day 29
Duchess Khrissalla and her party arrive at the edge of Dayside, venturing on deck into unfiltered sunlight for the first time as the terminal storm abates. Khriss rereads the letter announcing Prince Gevalden's death and discusses the mission's purpose with Baon - to find the Sand Mages Gevalden sought and secure their aid against Emperor Skathan. Meanwhile, sand master Kenton and his friend Traiben sandboard down to the Diem's camp near Mount KraeDa, where Kenton humiliates Lestrell Yeeden in a Zo'Ken contest by destroying all 25 targets with his single, exceptionally fast ribbon.
Chapter 2: Day 39
Khriss and her party reach the port of Dosha-Har'Ken and discover their linguist Professor Cynder has been learning the Daysider clerical language, causing every local they approach to scream and flee. They find a merchant who speaks the Dynastic script and hire his nephew Daazk as a guide to Lossand. Kenton attempts the Mastrell's Path across the Kerla, collecting five red spheres under time pressure; he improvises his way past obstacles his single ribbon cannot handle the conventional way, kills the deep sandling guarding the final sphere, and retrieves a hidden sixth sphere before collapsing from dehydration.
Chapter 3: Day 43
Khriss's party finds their guide Daazk speaks almost no Dynastic, nearly wastes their dwindling water supply, and presses on past a hostile village toward Mount KraeDa in search of a spring. At the Diem's rank ceremony, Kenton is demoted to Underfen for disobeying his father's orders - then immediately advanced to Mastrell using Drile's confiscated sash, though Praxton warns the other sand masters will always see it as nepotism. The ceremony is shattered by a surprise Kerztian attack; the sand masters find themselves dehydrating unnaturally fast, and Lord Mastrell Praxton sacrifices himself in a final devastating overburn to bury Kenton and the remaining warriors under a wave of sand.
Chapter 4: Day 47
Khriss's party discovers the aftermath of the Kerztian massacre at the Diem's camp; their guide Daazk flees in panic at the sight, is shot by Flennid, and the two soldiers then abandon the party and steal the remaining water. Kenton, the sole surviving sand master, is found alive in a tent by Baon and Cynder, and teaches the Darksiders to find dorim vines for water and how to ride tonks. He agrees to guide the group to Lossand, deducing along the way that Drile must have betrayed the Diem by refusing to drink the water before the attack; the party is ambushed by Kerztian warriors just as they enter the desert, and Kenton finds his sand mastery has stopped working.
Chapter 5: Day 53
Khriss and her companions are taken to Lonzare, the hidden Darkside quarter of Kezare, where they meet Loaten - a man the Dynasty claims to have executed, who knew Prince Gevalden personally and hints at knowing far more than he reveals. The shadowy Lord Beggar Nilto also makes a brief appearance, ordering Loaten to remove Khriss from the meeting. At the Diem, Kenton confronts Drile's challenge to his authority; after Drile goads him into a private meeting on the upper floors, Kenton reveals his newfound ability to control three ribbons and provokes Drile into attacking first - knocking him from the air in front of witnesses and demonstrating that he can reach the Lord Mastrell's quarters.
Chapter 6: Day 54
Khriss spends the day being turned away from every Taishin office in Kezare while trying to learn who Gevalden may have contacted, before being directed to the Diem by N'Teese. Arriving there, she confronts Kenton over his failure to mention he was the Lord Mastrell when they first met in the desert, but Kenton is too preoccupied to be lectured and retreats to his rooms, leaving Khriss to watch him ride sand ribbons to his balcony and remark to Baon that they appear to have found their sand mages.
Chapter 7: Day 55
Khriss learns from N'Teese that all the senior sand masters who might have met Gevalden were killed in the Kerla attack, forcing her to reconsider her approach; Professor Cynder suggests she use her diplomatic skills to help Kenton save the Diem instead. Kenton and Aarik discover the Diem owes seven million lak - a seemingly impossible debt - then visit Lord Artisan Rite with Khriss acting as diplomat, securing his vote by offering sand masters a percentage-based working arrangement. That evening, Kenton is attacked in his rooms by terken-coated assassins immune to sand mastery; he and Senior Trackt Ais fight them off, and Ais reveals he has been marked by a DaiKeen family under Ker'reen law and will face further attacks every other day.
Chapter 8: Day 56 (Sixth Hour)
Kenton travels more than a day into the deep sand to meet Lord General Raagent on a military hunting expedition, attempting to secure his vote while Raagent deliberately ignores his disinherited son Aarik. The Lord General makes clear he wants only to absorb the Diem's reputation into the Tower and sees sand mastery as useless for anything beyond tricks. When Raagent's men wound a juvenile KaRak and its mother arrives to defend it, Kenton throws himself back into danger to save the soldiers and the pinned Lord General, killing the massive deep sandling with a ribbon through its eye - then quietly reminds Raagent that he is one of the weakest sand masters.
Chapter 9: Day 56 (Late)
Lord General Raagent expresses surprise that Kenton managed to kill the deep sandling with a single sand ribbon, acknowledging the feat even as he refuses to concede the political argument. The party returns from the deep sand border in uneasy silence.
Chapter 10: Day 57 (Early)
At dawn at the deep sand border, Kenton fights off a female DaiKeen assassin who has coated herself in terken oil to neutralise his sand mastery; he defeats her by rolling them both toward a buried DelRak ambush predator and flinging himself clear at the last moment.
Chapter 11: Day 57
The party rides back to the Diem, where Drile is rallying sand masters against Kenton's absent leadership; Kenton silences him by issuing a formal duel challenge, to be held before the council vote. That evening, Kenton and Dirin run experiments revealing how opposing sand ribbons cancel each other on head-on collision. Ais investigates Sharezan's manipulation of the Kezare boat races and Kenton's party visits the Lord Merchant Vey, who refuses to vote for the Diem on religious grounds; Kenton receives an invitation from Lord Admiral Delius to a ball in his honour.
Chapter 12: Day 59
Kenton visits Khriss in Lonzare and learns she has struck a deal with the Lord Beggar Nilto - if the Diem can demonstrate benefit to the lower classes, Nilto will help sway public opinion. Khriss deduces that the Diem's uncollected tribute money must still exist and the two begin searching hidden compartments in the former Mastrells' desks, finding five thousand lak - meaningful but far short of the millions owed. Khriss conducts experiments in her improvised laboratory and reveals that Dayside white sand and sandling carapace share the same microscopic structure, and that mastered sand glows with the same opalescent light as wet white sand - promising early evidence that sand mastery might be understood scientifically.
Chapter 13: Day 61
Khriss confronts Baon about his Elisian officer pistols and he admits openly that he killed Captain Deral on the Dynasty's orders - his cover blown when Cynder and Acron walk in on the exchange. Shaken, Khriss resolves to find Kenton, who is meanwhile publicly announcing to the assembled Diem that sand masters will henceforth serve the people of Lossand rather than stand apart from them. Before he can continue, Khriss bursts through the main doors and declares she is ready to become a sand master herself.