The Case of the Duplicate Daughter Author:Erle Stanley Gardner Carter Gilman vanished. — It might have been simply a case of planned disappearance. His wife and stepdaughter and a guest were still sleeping upstairs. His daughter Muriell was in the kitchen cooking him an egg. When she came to the dining room to bring it to him, he was gone. — His briefcase was still there. On the breakfast table were some pape... more »rs he'd been checking. And stapled to the folder was a card in his handwriting, which read: In case of any emergency call Perry Mason, the attorney, at once. Call no one else!« less