From

Douglass presents an original variation on the theme of the man, or in this case, magus, who must undo the harm he unwittingly put in motion. On the plains of Ashod rises the great, glass-encased pyramid Threshold, a mathematical and architectural wonder that has taken the Magi and multitudes of slaves eight generations to build. Nearly completed, it awaits only its capstone. Meanwhile, the glassworker Tirzah, a slave, hides a secret from her masters: she can communicate with glass, and has heard the glass in Threshold scream in pain. The glass knows what Tirzah can but feel and the Magi wouldn't believe: that, more than a building, Threshold is a gateway. When it is completed, something from another dimension will come through it. Already, it has started taking lives. Can Tirzah and her fellow slaves halt the construction? Will Boaz, the magus whose alternating kindness and sternness to Tirzah leave her hoping but confused, accept the truth before the capstone is placed? Full of original touches, this is very good storytelling. Frieda Murray
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Product Description

Over the hot southern land of Ashdod looms the shadow of Threshold, the pyramid which the Magi of Ashdod are building to propel themselves into Infinity. Over the years, thousands of slaves have given their lives to the construction of Threshold. Now construction is almost complete; the Magi need only to add the finishing touches.

The Master of the Magi knows the glassworker slave Tirzah is hiding something, but he would never guess her secret is forbidden magic. Tirzah can communicate with glass-and the glass in Threshold screams to her in pain. For it knows what neither Tirzah nor any of the Magi suspect:

Something waits in Infinity, watching, biding its time, and when the final glass plate is laid and the capstone cemented in blood, it plans to use Threshold to step from Infinity into Ashdod...