Brick by Brick. Mathilda Holiday, #4

A handful of mages against an ancient international secret society - what could go wrong?Mattie and Tillie Holiday and their ragtag band of rebel agents have been through hell and back. They've lost allies. They've uncovered secrets. And they're closer than ever to bringing down the organization that has hunted them from the start. But the Auditors are far from finished. Obscure spells surface one after another.
Agents fall. Others defect. It becomes painfully clear that the society has been collecting powerful, rare magics for centuries - forces most mages have never even heard of, let alone faced. The cracks are beginning to show. Can Mattie, Tillie, Trevor, and their dwindling allies hold the line long enough to dismantle the organization from the inside? Or will they join the long list of those who tried - and failed?Brick by Brick is the fourth book in the Mathilda Holiday series - a fast-paced urban fantasy of secret societies, dangerous magic, and the rising cost of resistance.