Means and Ends: The Blood Princess Saga Book 5
Jessica Short
Because it's a dimensional crossroad, even the Gods keep an eye on the City of Gates. This is brought home to the Black Bitches when Gwendolen the team's cleric is 'requested' by her church to stop a trade deal between two other dimensions. The only problem is that the deal is going down in the one place in the city where mortals have never broken into.