A new mentor. A dangerous task. And a betrayal no one saw coming.

Fresh off their harrowing second year, Iona and her mismatched allies finally gain a mentor within the Obelisk-an enigmatic figure offering guidance, purpose and secrets. As the team unravels magical puzzles and hunts for relics, something darker simmers beneath the surface-a threat to the Coterie that may be more than just politics.

In a cursed land beneath an ominous eclipse, they'll face ancient prophecies, ruthless enemies, and a cunning adversary who always seems one step ahead. To protect the city and each other, they'll have to outwit the mastermind behind it all-and survive the fallout of their own mistakes.

Victory may come at a cost and this time, the damage might be permanent.