When Batgirl and Supergirl investigate mysterious tremors in Gotham Bay, they dive underwater and discover... Lex Luthor! The crooked businessman is running a mining operation to dig up deep-sea Kryptonite deposits.
When a weird, wild wail echoes from the Metropolis Museum, Batgirl and Supergirl rush inside ready for a fight. But all they discover are groggy workers-and one ancient tome missing from a rare book exhibit.
