Oracle's secrets--unlocked at last! The origin of the new Oracle--the super-hacker who has become an invaluable ally to the Birds of Prey--is revealed in the newest collection of Batgirl and the Birds of Prey. But will Oracle's connection to the mastermind known as Calculator end his relationship with Batgirl, Black Canary, and the Huntress? And how do Catwoman and another villain figure into the calculation? Plus, Black Canary goes undercover to discover the secrets of th woman called Blackbird, who can unlock any super-being's true potential. But Blackbird doesn't just enhance powers--she takes them for herself, making her an army of one who threatens the Birds of Prey's biggest secrets. Can guest-stars Green Arrow and Nightwing turn the tide against this incredible new foe? Or will they be Blackbird's newest victims?--back cover.