A shadow is looming over the hot southern land of Ashdod - the shadow of Threshold, the Pyramid which the Magi are building to send them into Infinity. Thousands of slaves have been used in the construction of Threshold. Tirzah, a young glass worker, has a secret gift - she can communicate with glass. And what the glass screams at her every time she touches her drives her to despair. Because something is waiting in Infinity - waiting for the final glass plate to be laid, for the capstone to be cemented in blood - waiting to use Threshold to step from Infinity and into Ashdod. Boaz, Master Magus, is watching Tirzah. He knows she's hiding something and he'll do whatever it takes to discover it. Cover art by Shaun Tan.