Cassandra Cain is caught in a Joker's Tie-In story, where the Joker has created chaos, releasing criminals from prison while injecting them with Joker "stuff".  Batgirl takes on one of the escape inmates, the Shadow Thief.  Will she be able to withstand his intangibility and Thanagarian Tech?  With the help of the Spoiler and The Orace, you betcha!