Lyra Vance has always been able to ask the sea for what she needs.
She has never been taught to explain how.
When a Founder's Scholarship takes her from a wind-scoured island to the prestigious Academy of Applied therics, she enters a world where magic is measured, catalogued and controlled. Every working requires a crucible, a formula, a catalyst-and a cost.
Lyra has none of them.
Her instinctive way of working ther is dismissed as unscientific, even dangerous. But the more she learns, the more she suspects that the Academy's rules were never designed simply to make magic safer. They were designed to decide who gets to wield it.
Then there is Dorian Vex: brilliant, controlled, and heir to a family whose wealth depends upon the very theric industry the Academy is beginning to challenge. He has been taught to trust measurements, markets and inherited certainty.
Lyra trusts the tide.
Neither of them is prepared for what lies beneath the Academy's crystal towers.
A discovery hidden for generations threatens to change what they understand about magic-and the people who control it. As secrets surface and the cost of uncovering them rises, Lyra must decide how much she is willing to sacrifice for the truth.
Because some debts can be repaid.
Some cannot.
THE CRUCIBLE OF THERA richly imagined academy fantasy of science and magic, inherited power and forbidden knowledge, where every discovery has a cost-and trust may be the most dangerous experiment of all.