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. A moment later, they're called to a break-in at S.T.A.R. Labs and find... Silver Banshee! The supernatural Super-Villain is scheming to broadcast a mind-control curse over the city! Batgirl and Supergirl are determined to stop the plot, but their...