Detective Comics (1937-) #418

The Creeper is unable to transform back into his Jack Ryder identity and is being driven insane by Dr. Yatz�s serum. But Yatz�s son Ishmael has the Creeper steal for him, promising to cure him of his condition, and Batman becomes involved with the case as a result. During the premiere of a new movie titled The Stepfather�based on the true story of the 1920s crime kingpin known as Floyd Marcus�premieres at a Gotham theater, Marcus (who is in attendance) is gunned down in cold blood upon his arrival. Recognizing the gunman as Marcus� stepson Mike, Barbara Gordon changes into Batgirl to search his estate for proof linking him to the murder.