The Reckoning of Sundermark

Sorcery in the Achenate Empire is not gathered; it is borrowed, and somebody always pays. Sabina Brannock is a reckoner, the clerk who calculates which town will be hollowed so that a battle can be won — where seed won't sprout, wounds won't close, and no child is ever conceived again. Sent to the besieged island city of Sundermark to price its future, she finds a murdered colleague, a girl no debt can touch, and a bill three centuries overdue.