Tangled Webs — Anne Bishop

The invitation was signed Jaenelle Angelline, and it summoned her family to an entertainment she had specially prepared. Surreal SaDiablo, former courtesan and assassin, arrives first. But when she enters the house, Surreal finds herelf trapped in a living nightmare created by the tangled webs of Black Widow witches ... and if she uses Craft to defend herself, she risks being sealed in the house forever.

But Jaenelle did not send the invitation. And now Jaenelle and her family must rescue Surreal and the others inside without becoming trapped themselves - and then discover who has created such a place, and why ...