Things have gone sideways in the Birds of Prey's investigation of the Ninth Day cult, and the Birds' undercover operative, Cassandra Cain, has gone deathly silent. The team going in to break her out are heavy hitters of the highest order -- Black Canary, Big Barda, Grace Choi, and Onyx -- with Oracle at mission control, and Sin frustrated she's been benched. But what they find is so much more than they feared...