Twin sisters Mattie and Tillie Holiday and their mishmash of rebel agents have been through hell and back, but they're still fighting. Reeling from the loss of two of their own, the group gathers to mourn, more determined than ever that the organization will fall at last.
But the organization is hitting them with obscure spell after obscure spell, and agents are falling or defecting left and right. It's becoming increasingly clear that the organization has gathered some pretty heavy magics over the centuries it's been around - magics that aren't available to most other mages.
Everything is hitting the fan all at once. Will their tiny army be able to muster enough force to take down the Pontiff and his goons once and for all? Or will they be squashed, like everyone else who has tried to take down the organization?
Brick by Brick is the fourth installment of the fast-paced Mathilda Holiday urban fantasy series.

Magic is real - and it's a bitch.
Mattie's life is going through a bit of a downward spiral these days. So when she learns that Tillie, her twin sister, is missing, she drops everything and rushes across the country to join her friend, Trevor, in the search.
As they start to dig, they stumble across a secret room in Tillie's condo filled with crystal balls and books about magic. Suddenly people all around them are doing spells, manipulating time, and disappearing into thin air, and they soon realize they're in over their heads.
A group of powerful mages is hunting Tillie. Will Mattie, Tillie, Trevor, and their friends be able to defeat them or will they be crushed under the relentless heels of an ancient power? Find out in this thrilling fast-paced action packed urban fantasy series!