Boston Unveiled

Boston Unveiled is a sourcebook for Mage: The Awakening. It covers the city of Boston, MA and the local powers residing there.

Summary
From the Onyx Path catalog:

That Old Black MagicThe first European mages to arrive in New England made dark compacts and concords that still affect the region to this day. From ancient oaths signed in blood to the dying curses of witches, Boston's modern mages are bound by fates not of their own making. The region's history weighs heavily on the shoulders of all... even from beyond the grave.A Sourcebook for Mage: The Awakening

Provides complete details on Mage's signature city, including a detailed secret history, geographical overview, and details on magical movers and shakers, malcontents and looming threats.
Includes new spells to cast, and much more for Mage players.
Full of cabals for Storytellers to use as allies and antagonists, as well as plenty of story seeds and other tools. A ready-to-play setting.
Builds on the material in the Boston appendix of the Mage rulebook.