From the back of the book:
To strike a blow against the Patriarchy, six women perform a dangerous rite in an abandoned priory. Through dance, they commune with Terpsichore, Greek muse and patroness of dancers.
Starving demons slither across the moors; monstrous nuns shriek in the infirmary; and within the Attic, a great unravelling awaits.
The fate of the world rests in the hands of the players. Will they bring about an egalitarian utopia? Will they skulk away in the night, pockets bulging with treasure? Will they bring about the destruction of all things?
Will they find the Tract of Teratology, a randomly-generated creature-summoning ritual with 3.6 quadrillion combinations?
After this adventure, nothing will be the same.