A series of games produced by AEG set in a shared world. The focus is the city-state Tempest.
From the publisher:
The City-State of Tempest is a lively metropolis—some say the largest in the world—yet behind the city's cultured exterior, age-old cabals vie for power, fighting one another for dominance in a society ripe with political and economic turmoil. Led by shadowy figures who command a small cadre of loyal followers, these secret societies work in concert to seize the wealth and power of the fabled City-State of Tempest.